Skip docker login and image push on pull requests

.github/workflows/docker-build-publish.yml

@@ -106,12 +106,14 @@ jobs:
           fetch-depth: 0
 
       - name: Authenticate to Docker Hub
+        if: github.event_name == 'push'
         uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Authenticate to GitHub Container Registry
+        if: github.event_name == 'push'
         uses: docker/login-action@v2
         with:
           registry: ghcr.io
@@ -247,7 +249,7 @@ jobs:
         with:
           context: .
           platforms: linux/amd64,linux/arm64
-          push: true
+          push: ${{ github.event_name == 'push' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |