Delete 5 month old FF branches

.github/workflows/delete-ff-branch.yml

@@ -0,0 +1,19 @@
+name: Remove old FF Branch
+on:
+  schedule:
+    - cron: '0 0 23 * *'
+jobs:
+  create_ff_branch:
+    name: Delete Feature Freeze Branch
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - id: date
+        run: echo "::set-output name=date::$(date -d '5 month ago' +'%Y.%m.01')"
+
+      - uses: dawidd6/action-delete-branch@v3
+        with:
+          branches: ${{ steps.date.outputs.date }}
+          github_token: ${{ github.token }}