Fix docker push to ghcr (#174)

.github/workflows/release.yml

@@ -6,31 +6,38 @@ on:
     tags:
       - 'v*'
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: otel-recipes/otlp-backend
+
 jobs:
   otlp-backend-docker:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: otel-recipes/otlp-backend
-
       - name: 'Login to GitHub Container Registry'
         uses: docker/login-action@v3
         with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
+          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: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
       - name: Build and push
         uses: docker/build-push-action@v5
         with:
           context: ./internal/otlp_backend
-          push: ${{ github.event_name != 'pull_request' }}
+          push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
   site: