chore: use pre-baked build images from cameleer-build-images

Replace maven:3.9-eclipse-temurin-17 with cameleer-build:1 (includes
Node.js 22, curl, jq). Replace docker:27 with cameleer-docker-builder:1
(includes git, curl, jq). Removes per-build tool installation steps.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -14,16 +14,11 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name != 'delete'
     container:
-      image: maven:3.9-eclipse-temurin-17
+      image: gitea.siegeln.net/cameleer/cameleer-build:1
+      credentials:
+        username: cameleer
+        password: ${{ secrets.REGISTRY_TOKEN }}
     steps:
-      - name: Install Node.js 22
-        run: |
-          apt-get update && apt-get install -y ca-certificates curl gnupg
-          mkdir -p /etc/apt/keyrings
-          curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
-          echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_22.x nodistro main" > /etc/apt/sources.list.d/nodesource.list
-          apt-get update && apt-get install -y nodejs
-
       - uses: actions/checkout@v4
 
       - name: Configure Gitea Maven Registry
@@ -67,11 +62,13 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name == 'push'
     container:
-      image: docker:27
+      image: gitea.siegeln.net/cameleer/cameleer-docker-builder:1
+      credentials:
+        username: cameleer
+        password: ${{ secrets.REGISTRY_TOKEN }}
     steps:
       - name: Checkout
         run: |
-          apk add --no-cache git
           git clone --depth=1 --branch=${GITHUB_REF_NAME} https://cameleer:${REGISTRY_TOKEN}@gitea.siegeln.net/${GITHUB_REPOSITORY}.git .
         env:
           REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
@@ -136,7 +133,6 @@ jobs:
         if: always()
       - name: Cleanup old container images
         run: |
-          apk add --no-cache curl jq
           API="https://gitea.siegeln.net/api/v1"
           AUTH="Authorization: token ${REGISTRY_TOKEN}"
           CURRENT_SHA="${{ github.sha }}"