Update docker-cleanup.yml

Author: stmh

.github/workflows/docker-cleanup.yml

@@ -15,6 +15,4 @@ jobs:
                   package-type: container
                   min-versions-to-keep: 5
                   delete-only-untagged-versions: true
-                  ignore-versions: |
-                      main
-                      v*
+                  ignore-versions: (main|next|v*)