chore(ci): update Docker workflow to v6, enable GHA caching, and clean up comments

.gitea/workflows/docker-publish.yaml

@@ -40,14 +40,17 @@ jobs:
             context: .
             dockerfile: config/docker/keycloak/Dockerfile
             image: keycloak
+
           - service: api-gateway
             context: .
             dockerfile: backend/infrastructure/gateway/Dockerfile
             image: gateway
+
           - service: ping-service
             context: .
             dockerfile: backend/services/ping/Dockerfile
             image: ping-service
+
           - service: web-app
             context: .
             dockerfile: config/docker/caddy/web-app/Dockerfile
@@ -81,7 +84,6 @@ jobs:
         if: matrix.service == 'web-app'
         run: |
           chmod +x gradlew
-          # Wir nutzen --no-daemon im Runner, geben aber mehr Memory
           ./gradlew :frontend:shells:meldestelle-portal:jsBrowserDistribution \
             -Pproduction=true \
             --max-workers=8 \
@@ -89,10 +91,10 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
-        with:
-          # Wir erzwingen die Nutzung des Host-Drivers,
-          # um gRPC-Abstürze im Container-Builder zu vermeiden
-          driver: docker
+#        with:
+#          # Wir erzwingen die Nutzung des Host-Drivers,
+#          # um gRPC-Abstürze im Container-Builder zu vermeiden
+#          driver: docker
 
       # Login bei deiner Gitea Registry
       - name: Log in to the Container registry
@@ -114,7 +116,7 @@ jobs:
 
       # Build und Push (Nativ ARM64 für maximale Geschwindigkeit)
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ${{ matrix.context }}
           file: ${{ matrix.dockerfile }}
@@ -130,7 +132,7 @@ jobs:
             JAVA_VERSION=${{ env.JAVA_VERSION }}
             KEYCLOAK_IMAGE_TAG=26.4
             JVM_OPTS_APPEND=${{ env.JVM_OPTS_ARM64 }}
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
-#          cache-from: type=gha
-#          cache-to: type=gha,mode=max
+#          cache-from: type=local,src=/tmp/.buildx-cache
+#          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+          cache-from: type=gha
+          cache-to: type=gha,mode=max