chore: enable stale GitHub action (#1107)

.github/workflows/stale.yml

@@ -0,0 +1,71 @@
+#
+# 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: 'Close stale issues and PRs'
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 1 * * *'
+
+permissions:
+  contents: read
+
+jobs:
+  stale:
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
+    name: Prune Stale
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/stale@v5
+        with:
+          days-before-issue-stale: 90
+          days-before-issue-close: 30
+          stale-issue-message: >
+            This issue has been marked as stale due to 90 days of inactivity.
+            It will be closed in 30 days if no further activity occurs. If this issue is still
+            relevant, please simply write any comment. Even if closed, you can still revive the
+            issue at any time or discuss it on the dev@apisix.apache.org list.
+            Thank you for your contributions.
+          close-issue-message: >
+            This issue has been closed due to lack of activity. If you think that
+            is incorrect, or the issue requires additional review, you can revive the issue at
+            any time.
+          days-before-pr-stale: 60
+          days-before-pr-close: 30
+          stale-pr-message: >
+            This pull request has been marked as stale due to 60 days of inactivity.
+            It will be closed in 30 days if no further activity occurs. If you think
+            that's incorrect or this pull request should instead be reviewed, please simply
+            write any comment. Even if closed, you can still revive the PR at any time or
+            discuss it on the dev@apisix.apache.org list.
+            Thank you for your contributions.
+          close-pr-message: >
+            This pull request/issue has been closed due to lack of activity. If you think that
+            is incorrect, or the pull request requires review, you can revive the PR at any time.
+          # Issues with these labels will never be considered stale.
+          exempt-issue-labels: 'triage/accepted,discuss,good first issue'
+          exempt-pr-labels: 'triage/accepted'
+          exempt-all-milestones: true
+          stale-issue-label: 'stale'
+          stale-pr-label: 'stale'
+          ascending: true