another try. Use same shell that builds roundup image to update base.

Author: rouilj

.github/workflows/anchore.yml

@@ -37,10 +37,8 @@ jobs:
     steps:
     - name: Checkout the code
       uses: actions/checkout@v3
-    - name: Update base image
-      run: docker pull python:3-alpine
     - name: Build the Docker image
-      run: docker build . --file scripts/Docker/Dockerfile --tag localbuild/testimage:latest
+      run: docker pull python:3-alpine; docker build . --file scripts/Docker/Dockerfile --tag localbuild/testimage:latest
     - name: Run the Anchore scan action itself with GitHub Advanced Security code scanning integration enabled
       uses: anchore/scan-action@v3
       id: scan