force shell in step

Author: anthony-nhs

.github/workflows/quality-checks.yml

@@ -219,6 +219,7 @@ jobs:
         id: normalized_docker_images
         env:
           DOCKER_IMAGES: ${{ inputs.docker_images }}
+        shell: bash
         run: |
           if [ "${{ inputs.run_docker_scan }}" != "true" ]; then
             echo "Docker scanning disabled; emitting empty image list."