Update publish-to-docker-hub.yml

Author: jacob-rosenthal

.github/workflows/publish-to-docker-hub.yml

@@ -26,6 +26,6 @@ jobs:
         uses: docker/[email protected]
         with:
           push: true
-          tags:
+          tags: |
             pathml/pathml:latest
             pathml/pathml:${{ env.VERSION }}