Use workflow version from lab

.github/workflows/flaskr-ci.yaml

@@ -33,7 +33,7 @@ jobs:
         run: |
           cd examples/tutorial
           pytest
-  # Build Docker image in a separate job so that it's not taited by cached python build/test files
+  # Build Docker image in a separate job so that it's not taited by cached build/test files
   build-image:
     needs: tests
     permissions:
@@ -44,7 +44,9 @@ jobs:
       - uses: actions/checkout@v3
       - name: Set job vars
         id: vars
-        run: echo "sha_short=${GITHUB_SHA:0:10}" >> $GITHUB_OUTPUT
+        run: |
+          echo "SHA_SHORT=${GITHUB_SHA:0:10}" >> ${GITHUB_ENV}
+          echo "REPO_LOWER_CASE=${GITHUB_REPOSITORY,,}" >> ${GITHUB_ENV}
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v2
         with:
@@ -56,4 +58,4 @@ jobs:
         with:
           context: examples/tutorial
           push: true
-          tags: "ghcr.io/${{ github.repository }}:${{ steps.vars.outputs.sha_short }}"
+          tags: "ghcr.io/${{ env.REPO_LOWER_CASE }}:${{ env.SHA_SHORT }}"