Merge pull request #566 from microbiomedata/564-publish-container-ima…

…ges-to-github-container-registry-ghcr-instead-of-docker-hub

Authenticate as workflow triggerer instead of as repo owner

.github/workflows/build-and-release-to-spin.yml

@@ -65,11 +65,12 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       # Reference: https://docs.docker.com/build/ci/github-actions/push-multi-registries/
+      # Reference: https://docs.github.com/en/actions/learn-github-actions/contexts#github-context
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
-          username: ${{ github.repository_owner }}
+          username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push