Enhance GitHub Actions workflow to support multi-architecture builds for agent-manager image

Author: jb0gie

.github/workflows/build-agent-manager.yml

@@ -1,4 +1,4 @@
-name: Build and Push agent-manager Image
+name: Build and Push agent-manager Image (Multi-Arch)
 
 on:
   push:
@@ -18,12 +18,8 @@ jobs:
         with:
           submodules: false
 
-      - name: Debug agent-manager files
-        run: |
-          ls -la agent-manager
-          ls -la agent-manager/src || echo "src not found"
-          ls agent-manager/src/*.js 2>/dev/null || echo "No .js files"
-          cat agent-manager/Dockerfile || echo "Dockerfile missing"
+      - name: Set up QEMU for multi-arch builds
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -35,10 +31,13 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push agent-manager
+      - name: Build and push multi-platform
         uses: docker/build-push-action@v6
         with:
           context: ./agent-manager
           file: ./agent-manager/Dockerfile
+          platforms: linux/amd64,linux/arm64/v8
           push: true
-          tags: ghcr.io/anentrypoint/agent-manager:latest
+          tags: ghcr.io/anentrypoint/agent-manager:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max