Push to quay.io on build

.github/workflows/build.yaml

@@ -15,5 +15,10 @@ jobs:
       - name: Build image with Dockerfile & repo2docker
         uses: jupyterhub/repo2docker-action@master
         with:
-          NO_PUSH: true
-          IMAGE_NAME: test
+          # Don't push the image during a PR build
+          NO_PUSH: "${{ github.event_name == 'pull_request' }}"
+          # Provide the username and password. These are empty when we are in a PR
+          DOCKER_USERNAME: ${{ secrets.QUAY_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.QUAY_PASSWORD }}
+          DOCKER_REGISTRY: "quay.io"
+          IMAGE_NAME: quay.io/2i2c/cellmap-segmentation-challenge-evaluator