Add correct path

Author: bwbroersma

.github/workflows/auto-update-container-documentation.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Cache Docker images
         uses: ScribeMD/[email protected]
         with:
-          key: docker-${{ runner.os }}-${{ hashFiles(paths) }}
+          key: docker-${{ runner.os }}-${{ hashFiles('.github/workflows/auto-update-container-documentation.yml') }}
       - name: make update_container_documentation
         id: update-container-documentation
         run: |