Fix clean-images action: make tags input optional

Co-authored-by: neilime <314088+neilime@users.noreply.github.com>

Author: Copilot

actions/docker/clean-images/action.yml

@@ -26,7 +26,7 @@ inputs:
     description: |
       Comma-separated list of tags to delete (supports wildcard syntax).
       Example: `pr-*,dev`
-    required: true
+    required: false
 
 outputs:
   deleted-package-ids: