Add a workflow for stale issues/PRs (#2319)

As it is written it will only affect issues labeled "awaiting contributor response"

Author: markmcd

.github/workflows/stale.yaml

@@ -0,0 +1,49 @@
+# This workflow warns and then closes issues and PRs that have had no activity for a specified amount of time.
+#
+# You can adjust the behavior by modifying this file.
+# For more information, see:
+# https://github.com/actions/stale
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+  # Scheduled to run at 1.30 UTC everyday
+  - cron: '30 1 * * *'
+  workflow_dispatch:
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+
+    steps:
+    - uses: actions/stale@v9
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        days-before-issue-stale: 14
+        days-before-issue-close: 14
+        stale-issue-label: "status:stale"
+        close-issue-reason: not_planned
+        any-of-labels: "awaiting contributor response,cla:no"
+        stale-issue-message: >
+          Marking this issue as stale since it has been open for 14 days with no activity.
+          This issue will be closed if no further activity occurs.
+        close-issue-message: >
+          This issue was closed because it has been inactive for 28 days.
+          Please post a new issue if you need further assistance. Thanks!
+        days-before-pr-stale: 14
+        days-before-pr-close: 14
+        stale-pr-label: "status:stale"
+        stale-pr-message: >
+          Marking this pull request as stale since it has been open for 14 days with no activity.
+          This PR will be closed if no further activity occurs.
+        close-pr-message: >
+          This pull request was closed because it has been inactive for 28 days.
+          Please open a new pull request 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'
+        # Label that can be assigned to PRs to exclude them from being marked as stale
+        exempt-pr-labels: "override-stale"