added cleanup

.github/workflows/cleanup-runs.yaml

@@ -0,0 +1,16 @@
+name: Cleanup Runs
+on: [push]
+
+jobs:
+  del_runs:
+    permissions:
+      actions: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete workflow runs
+        uses: Mattraks/delete-workflow-runs@v2
+        with:
+          token: ${{ github.token }}
+          repository: ${{ github.repository }}
+          retain_days: 7
+          keep_minimum_runs: 4