chore: Add stalebot for external issues and google-contributor PRs in Python Agentplatform SDK

PiperOrigin-RevId: 932600949

Author: matthew29tang

.github/workflows/google-contributor-stale.yml

@@ -0,0 +1,27 @@
+# This workflow closes PRs that have had no activity for 14 days.
+name: Close inactive google-contributor PRs
+
+on:
+  schedule:
+    - cron: "30 2 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      issues: write
+
+    steps:
+      - uses: actions/stale@v5
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          any-of-labels: "google-contributor"
+          days-before-pr-stale: 14
+          days-before-pr-close: 0
+          stale-pr-label: "status:stale"
+          exempt-pr-labels: "override-stale"
+          close-pr-message: >
+            This google-contributor PR has been inactive for 14 days.
+          days-before-issue-stale: -1
+          days-before-issue-close: -1

.github/workflows/stale.yml

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+# This workflow warns and then closes issues that have had no activity for a specified amount of time.
+name: Mark and close stale issues
+
+on:
+  schedule:
+  # Scheduled to run at 1:30 UTC everyday
+  - cron: '30 1 * * *'
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+
+    steps:
+    - uses: actions/stale@v5
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        days-before-issue-stale: 7
+        days-before-issue-close: 2
+        stale-issue-label: "status:stale"
+        close-issue-reason: not_planned
+        any-of-labels: "status:awaiting user response"
+        remove-stale-when-updated: true
+        labels-to-remove-when-unstale: 'status:awaiting user response,status:stale'
+        stale-issue-message: >
+          This issue has been marked as stale because it has been open for 7 days with no activity. It will be closed in 2 days if no further activity occurs.
+        close-issue-message: >
+          This issue was closed because it has been inactive for 9 days.
+          Please post a new issue if you need further assistance. Thanks!
+        # Label that can be assigned to issues to exclude them from being marked as stale
+        exempt-issue-labels: 'override-stale'