Merge pull request #11564 from owncloud/ci/rsb-ga

ci: remove stale branches github action

Author: kobergj

.github/remove_stale_branches.yml

@@ -0,0 +1,23 @@
+name: Remove stale branches
+on:
+  workflow_dispatch:
+    inputs:
+      dry-run:
+        description: 'Run in dry-run mode (no actual branch deletion)'
+        required: true
+        default: 'false'
+        type: boolean
+  schedule:
+    - cron: "0 0 * * *" # Everday at midnight
+permissions: write-all
+
+jobs:
+  remove-stale-branches:
+    name: Remove Stale Branches
+    runs-on: ubuntu-latest
+    steps:
+      - uses: fpicalausa/remove-stale-branches@v1.6.0
+        with:
+          ignore-unknown-authors: true
+          default-recipient: "kobergj"
+          dry-run: ${{ inputs.dry-run || 'true' }} # fallback to dry-run