CI: add action to close inactive issues labeled as 'more info required'.

Author: greenrobot-team

.github/workflows/close-no-response.yml

@@ -0,0 +1,21 @@
+name: Close inactive issues
+on:
+  schedule:
+    - cron: "20 1 * * *" # “At 01:20.” Avoid using top of the hour to reduce load on GitHub.
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      # https://github.com/marketplace/actions/close-stale-issues
+      - uses: actions/stale@v5
+        with:
+          days-before-stale: -1 # Add the stale label manually.
+          days-before-close: 21
+          only-labels: "more info required"
+          stale-issue-label: "more info required"
+          close-issue-message: "Without additional information, we are unfortunately not sure how to resolve this issue. Therefore this issue has been automatically closed. Feel free to comment with additional details and we can re-open this issue."
+          close-pr-message: "Without additional information, we are unfortunately not sure how to address this pull request. Therefore this pull request has been automatically closed. Feel free to comment with additional details or submit a new pull request."