fix(ci): preserve dependency parent layers during review cleanup

scripts/cleanup-review-images.sh

@@ -14,5 +14,6 @@ for repository in creative-studio-review creative-wiki-tests creative-wiki-revie
   echo "Keeping container-referenced review image: $tag"
   continue
  fi
- docker image rm "$tag"
+ # Preserve parent layers so unchanged dependency installs stay cached.
+ docker image rm --no-prune "$tag"
 done

scripts/test-review-image-cleanup.py

@@ -38,11 +38,11 @@ class ReviewCleanupTests(unittest.TestCase):
                 'DOCKER_CALLS': str(calls), 'REVIEW_SHA': sha, **extra})
             return result.returncode, [json.loads(line) for line in calls.read_text().splitlines()] if calls.exists() else []
 
-    def test_removes_only_exact_review_tags_without_force(self):
+    def test_removes_only_exact_review_tags_without_force_and_keeps_parent_cache(self):
         code, calls = self.run_cleanup()
         self.assertEqual(code, 0)
         self.assertEqual([args for args in calls if args[:2] == ['image', 'rm']], [
-            ['image', 'rm', name + ':' + SHA] for name in
+            ['image', 'rm', '--no-prune', name + ':' + SHA] for name in
             ['creative-studio-review', 'creative-wiki-tests', 'creative-wiki-review']])
         self.assertFalse(any('-f' in args or 'prune' in args or 'volume' in args for args in calls))