Add bot to manage stale PRs (#5300)

.github/workflows/stale.yml

@@ -0,0 +1,26 @@
+name: 'Stale PR Bot'
+on:
+  schedule:
+    - cron: '0 4 * * *'
+
+permissions:
+  pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639 # v9.1.0
+        with:
+          days-before-issue-stale: -1 # disabled for issues
+
+          days-before-pr-stale: 90 # 3 months
+          days-before-pr-close: 14 # 2 weeks
+          stale-pr-label: "stale"
+          exempt-pr-labels: "keep-open"
+          exempt-draft-pr: true
+          stale-pr-message: |
+            This pull request has been marked as stale due to 90 days of inactivity.
+            If this is still relevant, please update or comment to keep it open.
+            If this should be kept open indefinitely, please apply the label `keep-open`.
+            Otherwise, it will be automatically closed after 14 days.

scripts/verify-ci-config.js

@@ -159,9 +159,31 @@ checkPlugins(path.join(__dirname, '..', '.github', 'workflows', 'appsec.yml'))
 /// / Verifying that tests run on correct triggers
 /// /
 
+const IGNORED_WORKFLOWS = {
+  all: [
+    'prepare-release-proposal.yml',
+    'rebase-release-proposal.yml',
+    'release-3.yml',
+    'release-4.yml',
+    'release-dev.yml',
+    'release-latest.yml',
+    'release-proposal.yml',
+    'codeql-analysis.yml',
+    'pr-labels.yml'
+  ],
+  trigger_pull_request: [
+    'stale.yml'
+  ],
+  trigger_push: [
+    'package-size.yml',
+    'stale.yml'
+  ],
+  trigger_schedule: []
+}
+
 const workflows = fs.readdirSync(path.join(__dirname, '..', '.github', 'workflows'))
   .filter(file =>
-    !['release', 'codeql', 'pr-labels']
+    !IGNORED_WORKFLOWS.all
       .reduce((contained, name) => contained || file.includes(name), false)
   )
 
@@ -173,13 +195,16 @@ for (const workflow of workflows) {
   const yamlPath = path.join(__dirname, '..', '.github', 'workflows', workflow)
   const yamlContent = yaml.parse(fs.readFileSync(yamlPath, 'utf8'))
   const triggers = yamlContent.on
-  if (triggers?.pull_request !== null) {
+  if (!IGNORED_WORKFLOWS.trigger_pull_request.includes(workflow) &&
+      triggers?.pull_request !== null) {
     triggersError(workflow, 'The `pull_request` trigger should be blank')
   }
-  if (workflow !== 'package-size.yml' && triggers?.push?.branches?.[0] !== 'master') {
+  if (!IGNORED_WORKFLOWS.trigger_push.includes(workflow) &&
+      triggers?.push?.branches?.[0] !== 'master') {
     triggersError(workflow, 'The `push` trigger should run on master')
   }
-  if (triggers?.schedule?.[0]?.cron !== '0 4 * * *') {
+  if (!IGNORED_WORKFLOWS.trigger_schedule.includes(workflow) &&
+      triggers?.schedule?.[0]?.cron !== '0 4 * * *') {
     triggersError(workflow, 'The `cron` trigger should be \'0 4 * * *\'')
   }
 }