fix(docker): add multi-platform builds (amd64 + arm64)

Author: uid4oe

.dockerignore

@@ -15,3 +15,5 @@ docs/
 .DS_Store
 coverage/
 .turbo/
+demo/
+.github/

.github/workflows/docker.yml

@@ -20,13 +20,16 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - uses: docker/setup-qemu-action@v3
+
       - uses: docker/setup-buildx-action@v3
 
       - name: Build and push server
         uses: docker/build-push-action@v6
         with:
           context: .
           file: server/Dockerfile
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: |
             ghcr.io/uid4oe/agent-orchestration-patterns-server:latest
@@ -39,6 +42,7 @@ jobs:
         with:
           context: .
           file: frontend/Dockerfile
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: |
             ghcr.io/uid4oe/agent-orchestration-patterns-frontend:latest