feat: add feature branch deployments with per-branch isolation

Enable deploying feature branches into isolated environments on the same
k3s cluster. Each branch gets its own namespace (cam-<slug>), PostgreSQL
schema, and OpenSearch index prefix for data isolation while sharing the
underlying infrastructure.

- Make OpenSearch index prefix and DB schema configurable via env vars
  (defaults preserve existing behavior)
- Restructure deploy/ into Kustomize base + overlays (main/feature)
- Extend CI to build Docker images for all branches, not just main
- Add deploy-feature job with namespace creation, secret copying,
  Traefik Ingress routing (<slug>-api/ui.cameleer.siegeln.net)
- Add cleanup-branch job to remove namespace, PG schema, OS indices
  on branch deletion
- Install required tools (git, jq, curl) in CI deploy containers

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/search/OpenSearchIndex.java

@@ -17,6 +17,7 @@ import org.opensearch.client.opensearch.core.search.Hit;
 import org.opensearch.client.opensearch.indices.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Repository;
 
 import java.io.IOException;
@@ -30,25 +31,29 @@ import java.util.stream.Collectors;
 public class OpenSearchIndex implements SearchIndex {
 
     private static final Logger log = LoggerFactory.getLogger(OpenSearchIndex.class);
-    private static final String INDEX_PREFIX = "executions-";
     private static final DateTimeFormatter DAY_FMT = DateTimeFormatter.ofPattern("yyyy-MM-dd")
             .withZone(ZoneOffset.UTC);
 
     private final OpenSearchClient client;
+    private final String indexPrefix;
 
-    public OpenSearchIndex(OpenSearchClient client) {
+    public OpenSearchIndex(OpenSearchClient client,
+                           @Value("${opensearch.index-prefix:executions-}") String indexPrefix) {
         this.client = client;
+        this.indexPrefix = indexPrefix;
     }
 
     @PostConstruct
     void ensureIndexTemplate() {
+        String templateName = indexPrefix + "template";
+        String indexPattern = indexPrefix + "*";
         try {
             boolean exists = client.indices().existsIndexTemplate(
-                    ExistsIndexTemplateRequest.of(b -> b.name("executions-template"))).value();
+                    ExistsIndexTemplateRequest.of(b -> b.name(templateName))).value();
             if (!exists) {
                 client.indices().putIndexTemplate(PutIndexTemplateRequest.of(b -> b
-                        .name("executions-template")
-                        .indexPatterns(List.of("executions-*"))
+                        .name(templateName)
+                        .indexPatterns(List.of(indexPattern))
                         .template(t -> t
                                 .settings(s -> s
                                         .numberOfShards("3")
@@ -65,7 +70,7 @@ public class OpenSearchIndex implements SearchIndex {
 
     @Override
     public void index(ExecutionDocument doc) {
-        String indexName = INDEX_PREFIX + DAY_FMT.format(doc.startTime());
+        String indexName = indexPrefix + DAY_FMT.format(doc.startTime());
         try {
             client.index(IndexRequest.of(b -> b
                     .index(indexName)
@@ -98,7 +103,7 @@ public class OpenSearchIndex implements SearchIndex {
     public long count(SearchRequest request) {
         try {
             var countReq = CountRequest.of(b -> b
-                    .index(INDEX_PREFIX + "*")
+                    .index(indexPrefix + "*")
                     .query(buildQuery(request)));
             return client.count(countReq).count();
         } catch (IOException e) {
@@ -111,7 +116,7 @@ public class OpenSearchIndex implements SearchIndex {
     public void delete(String executionId) {
         try {
             client.deleteByQuery(DeleteByQueryRequest.of(b -> b
-                    .index(List.of(INDEX_PREFIX + "*"))
+                    .index(List.of(indexPrefix + "*"))
                     .query(Query.of(q -> q.term(t -> t
                             .field("execution_id")
                             .value(FieldValue.of(executionId)))))));
@@ -123,7 +128,7 @@ public class OpenSearchIndex implements SearchIndex {
     private org.opensearch.client.opensearch.core.SearchRequest buildSearchRequest(
             SearchRequest request, int size) {
         return org.opensearch.client.opensearch.core.SearchRequest.of(b -> {
-            b.index(INDEX_PREFIX + "*")
+            b.index(indexPrefix + "*")
              .query(buildQuery(request))
              .trackTotalHits(th -> th.enabled(true))
              .size(size)

cameleer3-server-app/src/main/resources/application.yml

@@ -3,13 +3,15 @@ server:
 
 spring:
   datasource:
-    url: jdbc:postgresql://localhost:5432/cameleer3
+    url: jdbc:postgresql://localhost:5432/cameleer3?currentSchema=${CAMELEER_DB_SCHEMA:public}
     username: cameleer
     password: ${CAMELEER_DB_PASSWORD:cameleer_dev}
     driver-class-name: org.postgresql.Driver
   flyway:
     enabled: true
     locations: classpath:db/migration
+    schemas: ${CAMELEER_DB_SCHEMA:public}
+    default-schema: ${CAMELEER_DB_SCHEMA:public}
   mvc:
     async:
       request-timeout: -1
@@ -34,6 +36,7 @@ ingestion:
 
 opensearch:
   url: ${OPENSEARCH_URL:http://localhost:9200}
+  index-prefix: ${CAMELEER_OPENSEARCH_INDEX_PREFIX:executions-}
   queue-size: ${CAMELEER_OPENSEARCH_QUEUE_SIZE:10000}
   debounce-ms: ${CAMELEER_OPENSEARCH_DEBOUNCE_MS:2000}