fix image build

.github/workflows/go.yml

@@ -52,29 +52,37 @@ jobs:
     runs-on: ubuntu-latest
     needs: [lint, test]
     if: startsWith(github.event.ref, 'refs/tags/v')
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
     steps:
 
-    - name: Check out the repo
-      uses: actions/checkout@v4
+    - uses: actions/checkout@v4
+    - uses: docker/setup-qemu-action@v3
+    - uses: docker/setup-buildx-action@v3
 
     - name: Log in to Docker Hub
       uses: docker/login-action@v3
       with:
-        registry: ghcr.io
+        registry: ${{ env.REGISTRY }}
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Extract metadata (tags, labels) for Docker
       id: meta
       uses: docker/metadata-action@v5
       with:
-        images: teamwork/kommentaar
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
     - name: Build and push Docker image
       uses: docker/build-push-action@v5
       with:
         context: .
+        platforms: linux/amd64,linux/arm64
         file: ./Dockerfile
         push: true
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
+