CI: add issues-helper (#35846)

.github/workflows/issue-close-require.yml

@@ -0,0 +1,19 @@
+name: Close Issue Awaiting Reply
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  issue-close-require:
+    runs-on: ubuntu-latest
+    if: github.repository == 'twbs/bootstrap'
+    steps:
+      - name: awaiting reply
+        uses: actions-cool/issues-helper@v3
+        with:
+          actions: "close-issues"
+          labels: "awaiting-reply"
+          inactive-day: 14
+          body: |
+            As the issue was labeled with `awaiting-reply`, but there has been no response in 14 days, this issue will be closed. If you have any questions, you can comment/reply.

.github/workflows/issue-labeled.yml

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+name: Issue Labeled
+
+on:
+  issues:
+    types: [labeled]
+
+jobs:
+  issue-labeled:
+    if: github.repository == 'twbs/bootstrap'
+    runs-on: ubuntu-latest
+    steps:
+      - name: awaiting reply
+        if: github.event.label.name == 'awaiting-reply'
+        uses: actions-cool/issues-helper@v3
+        with:
+          actions: "create-comment"
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            Hello @${{ github.event.issue.user.login }}. Bug reports must include a **live demo** of the issue. Per our [contributing guidelines](https://github.com/twbs/bootstrap/blob/main/.github/CONTRIBUTING.md), please create a reduced test case on [CodePen](https://codepen.io/) or [JS Bin](https://jsbin.com/) and report back with your link, Bootstrap version, and specific browser and Operating System details.