Update publish-docker-image.yaml

Author: wshaddix

.github/workflows/publish-docker-image.yaml

@@ -22,4 +22,5 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           push: true
-          tags: wshaddix/http-nats-proxy:${{ github.ref_name }}
+          file: src/Dockerfile
+          tags: wshaddix/http-nats-proxy:${{ github.ref_name }}