Delete old workflow runs.

.github/workflows/delete-old-workflow-runs.yml

@@ -0,0 +1,18 @@
+name: Delete old workflow runs
+on:
+ workflow_dispatch:
+ schedule:
+ - cron: '0 0 1 * *'
+# Run monthly, at 00:00 on the 1st day of month.
+
+jobs:
+ del_runs:
+ runs-on: ubuntu-latest
+ steps:
+ - name: Delete workflow runs
+ uses: Mattraks/delete-workflow-runs@v2
+ with:
+ token: ${{ github.token }}
+ repository: ${{ github.repository }}
+ retain_days: 30
+ keep_minimum_runs: 6