Only push docker image on push or tag (#288)

Author: anuraaga

.github/workflows/main.yml

@@ -171,7 +171,7 @@ jobs:
         with:
           context: .
           file: docker/Dockerfile
-          push: ${{ github.event_name != 'pull_request' }}
+          push: ${{ github.event_name != 'pull_request' && github.event_name != 'workflow_dispatch' }}
           platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}