pan3793 commented on code in PR #8451:
URL: https://github.com/apache/hadoop/pull/8451#discussion_r3135111813


##########
.github/workflows/build_image_cache.yml:
##########
@@ -0,0 +1,53 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: Image Cache
+
+# Security: write privileges are safe since this is triggered only by
+# `push` and `workflow_dispatch` (implying user has write access).
+on:
+  # Run jobs when a commit is merged
+  push:
+    branches:
+      - 'trunk'
+      - 'branch-*'
+    paths:
+      - 'dev-support/docker/**'

Review Comment:
   I think the cache is better.
   
   1. in most cases, no docker file change, cache hit and it works well
   2. if trunk merges a PR that has docker files change, it will take ~15min to 
refresh the cache, a new push happens in the forked PR will miss cache and do a 
refresh build
   3. if a PR itself contains docker files change, it must do a fresh build



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