Add --break-system-packages to container image pruning [ci skip]

Author: leonardehrenfried

.github/workflows/prune-container-images.yml

@@ -18,5 +18,5 @@ jobs:
         run: |
           # remove all snapshot container images that have not been pulled for over a year
           # --keep-semver makes sure that any image with a x.y.z version scheme is unaffected by this
-          pip install prune-container-repo==0.0.4
+          pip install prune-container-repo==0.0.4 --break-system-packages
           prune-container-repo -u ${CONTAINER_REGISTRY_USER} -r ${CONTAINER_REPO} --days=365 --keep-semver --activate