Add new workflows to auto-comment on new issue and stale PRs

Signed-off-by: Du Tran <[email protected]>

Author: quangdutran

.github/workflows/reminder-comment.yml

@@ -0,0 +1,22 @@
+name: Reminder Comment on New Issues
+on:
+  issues:
+    types:
+      - opened
+permissions:
+  issues: write
+
+jobs:
+  label_issue:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo (optional but avoids errors)
+        uses: actions/checkout@v4
+
+      - name: Comment on the new issue
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ISSUE_URL: ${{ github.event.issue.html_url }}
+          ISSUE_NUMBER: ${{ github.event.issue.number }}
+        run: |
+          gh issue comment "$ISSUE_NUMBER" --body $'**Thanks for opening this issue.**\n\nYou can help us to fix this issue faster by opening a pull request. See our [Contribution Guide](https://github.com/opensearch-project/.github/blob/main/CONTRIBUTING.md) if this is your first time contributing. 🙏'

.github/workflows/stale.yml

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+name: Mark Stale PRs
+on:
+  schedule:
+    - cron: '30 1 * * *''
+permissions:
+  pull-requests: write
+jobs:
+  mark-stale-pr:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          days-before-issue-stale: -1
+          days-before-issue-close: -1
+          stale-pr-label: 'stale'
+          stale-pr-message: 'This PR is stalled because it has been open for 30 days with no activity.'
+          days-before-pr-stale: 30
+          days-before-pr-close: -1
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+