feat(docker): add sha-retention-days to Docker Hub cleanup

* Introduced `sha-retention-days: 30` to retain SHA references for 30 days.
* Enhances the cleanup process by managing Docker Hub image retention more effectively.

Author: dgibbs64

.github/workflows/action-docker-publish.yml

@@ -183,4 +183,5 @@ jobs:
           password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
           repositories: "gameservermanagers/steamcmd"
           protected-tags: ubuntu, ubuntu-24.04, ubuntu-22.04, ubuntu-20.04
+          sha-retention-days: 30
           dry-run: false