Update Docker build workflow to enhance image build and push steps

.github/workflows/docker-build.yml

@@ -15,6 +15,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v3
         with:
@@ -29,6 +32,8 @@ jobs:
           file: ./backend/Dockerfile
           push: true
           tags: ghcr.io/${{ github.repository }}/suna-backend:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
       - name: Build and push Frontend image
         uses: docker/build-push-action@v5
@@ -36,4 +41,6 @@ jobs:
           context: ./frontend
           file: ./frontend/Dockerfile
           push: true
-          tags: ghcr.io/${{ github.repository }}/suna-frontend:latest
+          tags: ghcr.io/${{ github.repository }}/suna-frontend:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max