Create delete.yml

Author: xinyuli1204

.github/workflows/delete.yml

@@ -0,0 +1,12 @@
+name: Delete CDCI
+on: push
+
+jobs:
+  delete_runs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete workflow runs
+        uses: dmvict/clean-workflow-runs@v1.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          save_period: 180