Tools: Action to label Stale commits and PRs (#5852)

* Tools: Action to label Stale commits and PRs

What the title says!

Closes https://github.com/Automattic/themes/issues/5850

* added message

.github/workflows/stale.yml

@@ -0,0 +1,26 @@
+# 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:
+  - cron: '34 19 * * *'
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+
+    steps:
+    - uses: actions/stale@v5
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        days-before-stale: 30
+        days-before-close: -1
+        stale-issue-message: "As a part of this repository’s maintenance, this issue is being marked as stale due to inactivity. Please feel free to comment on it in case we missed something."
+        stale-issue-label: '[Status] Stale'