chore: hand cameleer-runtime-loader image build to cameleer-saas

The loader is infra glue (per-replica init container that fetches the
tenant JAR from a signed URL) — same shape as runtime-base, postgres,
clickhouse, traefik, logto images already living in cameleer-saas. Move
the source + CI build there so all sidecar/infra image builds are in
one place; cameleer-server's CI is back to building only what it owns
(server, server-ui).

Coordination: cameleer-saas@ac8d628 added the build step and copied the
source verbatim. Published tag path is unchanged
(gitea.siegeln.net/cameleer/cameleer-runtime-loader:latest), so running
tenant servers continue pulling the same image without disruption.

This commit:
- Deletes cameleer-runtime-loader/ (Dockerfile, entrypoint.sh, README).
- Removes the conditional "Build and push runtime-loader" step and its
  upstream "Detect runtime-loader changes" detection from .gitea/workflows/ci.yml.
  Drops the fetch-depth: 0 + outputs.loader_changed plumbing that only
  existed for the change-detection path.
- Drops cameleer-runtime-loader from the in-job and cleanup-branch image
  cleanup loops — saas owns the registry lifecycle now.
- Rewrites LoaderHardeningIT to pull the published :latest from the
  registry (via Testcontainers GenericContainer) instead of building
  from a local Dockerfile. The IT now functions as a cross-repo contract
  test: cameleer-server's hardening expectations vs. the saas-published
  artifact. Local devs need `docker login gitea.siegeln.net`; CI runners
  are pre-authenticated.
- Updates .claude/rules/docker-orchestration.md to point at the new
  source-of-truth location and reframe LoaderHardeningIT as the
  cross-repo contract test.

The image's runtime contract (ARTIFACT_URL, ARTIFACT_EXPECTED_SIZE,
/app/jars/app.jar mount, exit code semantics) is unchanged. Future
contract changes need coordinated commits across both repos.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/rules/docker-orchestration.md

@@ -41,7 +41,7 @@ When deployed via the cameleer-saas platform, this server orchestrates customer
 `startContainer` is now a two-phase op per replica:
 
 1. **Volume create** — `cameleer-jars-{containerName}` named volume (per-replica, deterministic so cleanup in `removeContainer` can derive it).
-2. **Loader container** — `loaderImage` (default `gitea.siegeln.net/cameleer/cameleer-runtime-loader:latest`), name `{containerName}-loader`, mount the volume **RW at `/app/jars`**, env vars `ARTIFACT_URL` + `ARTIFACT_EXPECTED_SIZE`. Loader downloads the JAR from the signed URL into the volume and exits 0. Orchestrator blocks on `waitContainerCmd().exec(WaitContainerResultCallback).awaitStatusCode(120, SECONDS)`. Loader container is removed in a `finally` block; on non-zero exit the volume is also removed and `RuntimeException` propagates so `DeploymentExecutor` marks the deployment FAILED. **Loader logs are captured before removal** (`captureLoaderLogs` — `logContainerCmd` with `withTail(50)`, capped at 4096 chars, 5s timeout) and appended to the thrown `RuntimeException` message as `". loader output: <text>"`. Best-effort: log-capture failures are swallowed and don't mask the original exit. The loader image's Dockerfile pre-creates `/app/jars` owned by `loader:loader` (UID 1000) so the orchestrator's fresh named volume initialises with that ownership — without it the empty volume comes up as `root:root 0755` and wget exits 1 with "Permission denied". `LoaderHardeningIT` is the regression guard.
+2. **Loader container** — `loaderImage` (default `gitea.siegeln.net/cameleer/cameleer-runtime-loader:latest`, **built and published by the cameleer-saas repo** at `docker/runtime-loader/`), name `{containerName}-loader`, mount the volume **RW at `/app/jars`**, env vars `ARTIFACT_URL` + `ARTIFACT_EXPECTED_SIZE`. Loader downloads the JAR from the signed URL into the volume and exits 0. Orchestrator blocks on `waitContainerCmd().exec(WaitContainerResultCallback).awaitStatusCode(120, SECONDS)`. Loader container is removed in a `finally` block; on non-zero exit the volume is also removed and `RuntimeException` propagates so `DeploymentExecutor` marks the deployment FAILED. **Loader logs are captured before removal** (`captureLoaderLogs` — `logContainerCmd` with `withTail(50)`, capped at 4096 chars, 5s timeout) and appended to the thrown `RuntimeException` message as `". loader output: <text>"`. Best-effort: log-capture failures are swallowed and don't mask the original exit. The loader image's Dockerfile pre-creates `/app/jars` owned by `loader:loader` (UID 1000) so the orchestrator's fresh named volume initialises with that ownership — without it the empty volume comes up as `root:root 0755` and wget exits 1 with "Permission denied". `LoaderHardeningIT` is the cross-repo contract test (pulls the published `:latest` and asserts exit 0 under the orchestrator's hardening shape).
 3. **Main container** — same hardening contract, mount the same volume **RO at `/app/jars`**, entrypoint reads `/app/jars/app.jar` (Spring Boot/Quarkus: `-jar /app/jars/app.jar`; plain Java: `-cp /app/jars/app.jar <MainClass>`; native: `exec /app/jars/app.jar`).
 
 `removeContainer(id)` derives the volume name from the inspected container name (Docker prefixes it with `/`) and removes the volume after the container removes — blue/green doesn't leak volumes.

.gitea/workflows/ci.yml

@@ -30,29 +30,8 @@ jobs:
       credentials:
         username: cameleer
         password: ${{ secrets.REGISTRY_TOKEN }}
-    outputs:
-      loader_changed: ${{ steps.loader_changed.outputs.changed }}
     steps:
       - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Detect runtime-loader changes
-        id: loader_changed
-        run: |
-          BEFORE="${{ github.event.before }}"
-          if [ -z "$BEFORE" ] \
-            || [ "$BEFORE" = "0000000000000000000000000000000000000000" ] \
-            || ! git cat-file -e "$BEFORE^{commit}" 2>/dev/null; then
-            echo "No prior commit available — assuming loader changed."
-            echo "changed=true" >> "$GITHUB_OUTPUT"
-          elif git diff --name-only "$BEFORE" "${{ github.sha }}" | grep -q '^cameleer-runtime-loader/'; then
-            echo "cameleer-runtime-loader/ changed since $BEFORE."
-            echo "changed=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "No changes under cameleer-runtime-loader/ — skipping image build."
-            echo "changed=false" >> "$GITHUB_OUTPUT"
-          fi
 
       - name: Configure Gitea Maven Registry
         run: |
@@ -177,19 +156,6 @@ jobs:
             --push ui/
         env:
           REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-      - name: Build and push runtime-loader
-        if: needs.build.outputs.loader_changed == 'true'
-        run: |
-          TAGS="-t gitea.siegeln.net/cameleer/cameleer-runtime-loader:${{ github.sha }}"
-          for TAG in $IMAGE_TAGS; do
-            TAGS="$TAGS -t gitea.siegeln.net/cameleer/cameleer-runtime-loader:$TAG"
-          done
-          docker buildx build --platform linux/amd64 \
-            $TAGS \
-            --provenance=false \
-            --push cameleer-runtime-loader/
-        env:
-          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
       - name: Cleanup local Docker
         run: docker system prune -af --filter "until=24h"
         if: always()
@@ -203,7 +169,7 @@ jobs:
           if [ "$BRANCH_SLUG" != "main" ]; then
             KEEP_TAGS="$KEEP_TAGS branch-$BRANCH_SLUG"
           fi
-          for PKG in cameleer-server cameleer-server-ui cameleer-runtime-loader; do
+          for PKG in cameleer-server cameleer-server-ui; do
             curl -sf -H "$AUTH" "$API/packages/cameleer/container/$PKG" | \
               jq -r '.[] | "\(.id) \(.version)"' | \
               while read id version; do
@@ -433,7 +399,7 @@ jobs:
         run: |
           API="https://gitea.siegeln.net/api/v1"
           AUTH="Authorization: token ${REGISTRY_TOKEN}"
-          for PKG in cameleer-server cameleer-server-ui cameleer-runtime-loader; do
+          for PKG in cameleer-server cameleer-server-ui; do
             # Delete branch-specific tag
             curl -sf -X DELETE -H "$AUTH" "$API/packages/cameleer/container/$PKG/branch-${BRANCH_SLUG}" || true
           done

cameleer-runtime-loader/Dockerfile

@@ -1,17 +0,0 @@
-# Tiny init-container image. No app code, no shell-injection surface — script
-# only sees env vars set by the orchestrator.
-FROM busybox:1.37-musl
-
-# Run as non-root (UID 1000 inside the container; with userns_mode this is
-# remapped to host UID ~101000 — fully unprivileged on the host).
-# Pre-create /app/jars owned by `loader` so the orchestrator's named-volume
-# mount inherits that ownership at first init — without it the empty named
-# volume comes up as root:root 0755 and wget can't write app.jar.
-RUN adduser -D -u 1000 loader && mkdir -p /app/jars && chown -R loader:loader /app
-
-COPY entrypoint.sh /usr/local/bin/loader
-RUN chmod +x /usr/local/bin/loader
-
-USER loader
-WORKDIR /app
-ENTRYPOINT ["/usr/local/bin/loader"]

cameleer-runtime-loader/README.md

@@ -1,23 +0,0 @@
-# cameleer-runtime-loader
-
-Init container that fetches the deployable JAR into a shared volume before the
-main runtime container starts. Pairs with `DockerRuntimeOrchestrator` /
-(future) K8s init-container deploys.
-
-## Build
-
-CI (`.gitea/workflows/ci.yml`, `docker` job) builds and pushes this image
-automatically on pushes that change anything under `cameleer-runtime-loader/`.
-Manual build for local testing:
-
-    docker build -t gitea.siegeln.net/cameleer/cameleer-runtime-loader:<tag> .
-    docker push gitea.siegeln.net/cameleer/cameleer-runtime-loader:<tag>
-
-## Contract
-
-- Env: `ARTIFACT_URL` (signed download URL), `ARTIFACT_EXPECTED_SIZE` (bytes).
-- Volume: writes `/app/jars/app.jar`.
-- Exit 0 on success; non-zero on fetch/size failure.
-- Runs as UID 1000 (loader user), drops all caps, read-only rootfs except `/app/jars`.
-
-See `docs/superpowers/plans/2026-04-27-init-container-jar-fetch.md`.

cameleer-runtime-loader/entrypoint.sh

@@ -1,25 +0,0 @@
-#!/bin/sh
-# cameleer-runtime-loader: fetches one JAR from a signed URL into the shared
-# /app/jars/ volume, verifies size, exits. Runs in the same hardened sandbox as
-# the main container (cap_drop ALL, read-only rootfs, etc.) — only /app/jars/
-# is writeable.
-set -eu
-
-: "${ARTIFACT_URL:?ARTIFACT_URL is required}"
-: "${ARTIFACT_EXPECTED_SIZE:?ARTIFACT_EXPECTED_SIZE is required}"
-
-OUT=/app/jars/app.jar
-mkdir -p /app/jars
-
-echo "loader: fetching artifact (expected $ARTIFACT_EXPECTED_SIZE bytes)"
-# -q quiet, -O output, --tries=3 retry transient network blips,
-# --timeout=30 cap stalls. wget exits non-zero on HTTP >=400.
-wget -q --tries=3 --timeout=30 -O "$OUT" "$ARTIFACT_URL"
-
-actual=$(wc -c < "$OUT")
-if [ "$actual" -ne "$ARTIFACT_EXPECTED_SIZE" ]; then
-    echo "loader: size mismatch — expected $ARTIFACT_EXPECTED_SIZE, got $actual" >&2
-    exit 2
-fi
-
-echo "loader: artifact written to $OUT ($actual bytes)"

cameleer-server-app/src/test/java/com/cameleer/server/app/runtime/LoaderHardeningIT.java

@@ -13,13 +13,11 @@ import org.testcontainers.containers.BindMode;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.containers.Network;
 import org.testcontainers.containers.startupcheck.OneShotStartupCheckStrategy;
-import org.testcontainers.images.builder.ImageFromDockerfile;
 import org.testcontainers.junit.jupiter.Testcontainers;
 
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.time.Duration;
 import java.util.List;
 import java.util.Map;
@@ -37,14 +35,19 @@ import static org.assertj.core.api.Assertions.assertThat;
  * {@link DockerRuntimeOrchestrator}'s {@code baseHardenedHostConfig()} +
  * loader-specific bind, against a real artifact server, and asserts the
  * loader writes the expected file.
+ *
+ * <p>Image source: the loader's Dockerfile lives in the cameleer-saas repo
+ * (`docker/runtime-loader/`) and is built+pushed by saas CI. This IT pulls
+ * the published `:latest` tag — running it locally requires a `docker login
+ * gitea.siegeln.net` (CI runners are pre-authenticated). The IT acts as a
+ * cross-repo contract test: cameleer-server's hardening expectations versus
+ * the saas-published artifact.
  */
 @Testcontainers
 class LoaderHardeningIT {
 
-    private static final Path LOADER_DIR = Paths
+    private static final String LOADER_IMAGE =
-            .get(System.getProperty("user.dir"))
+            "gitea.siegeln.net/cameleer/cameleer-runtime-loader:latest";
-            .getParent()
-            .resolve("cameleer-runtime-loader");
 
     private static final int ARTIFACT_BYTES = 1024;
 
@@ -54,7 +57,6 @@ class LoaderHardeningIT {
     private GenericContainer<?> loader;
     private Path fixtureDir;
     private String volumeName;
-    private String loaderImageId;
 
     @BeforeEach
     void setUp() throws IOException {
@@ -74,10 +76,6 @@ class LoaderHardeningIT {
                         BindMode.READ_ONLY);
         fileServer.start();
 
-        loaderImageId = new ImageFromDockerfile()
-                .withFileFromPath(".", LOADER_DIR)
-                .get();
-
         volumeName = "cameleer-loader-it-" + UUID.randomUUID().toString().substring(0, 8);
         dockerClient.createVolumeCmd().withName(volumeName).exec();
     }
@@ -107,7 +105,7 @@ class LoaderHardeningIT {
         // exited with status 0. Anything else (non-zero exit, timeout) throws
         // ContainerLaunchException — the assertion below is a belt-and-braces
         // explicit check on the resolved exit code.
-        loader = new GenericContainer<>(loaderImageId)
+        loader = new GenericContainer<>(LOADER_IMAGE)
                 .withNetwork(network)
                 .withEnv("ARTIFACT_URL", "http://file-server/artifact.jar")
                 .withEnv("ARTIFACT_EXPECTED_SIZE", String.valueOf(ARTIFACT_BYTES))