[ci] update werf cleanup rules (#1302)

* [ci] update werf cleanup rules

Signed-off-by: Aleksey Gavrilov <[email protected]>

Author: alexey-gavrilov-flant

werf_cleanup.yaml

@@ -11,6 +11,8 @@ cleanup:
       limit:
         in: 168h # keep dev images build during last week which not main|pre-alpha
   - references:
-      branch: /main|pre-alpha|release-.*/
+      branch: /main|release-[0-9]+.*/
+      limit:
+        last: 5 # keep 5 images for branches release-* and main
     imagesPerReference:
-      last: 5 # keep 5 images for branches main|pre-alpha
+      last: 1