Action to delete stale builds

.github/workflows/delete_stale_workflow.yaml

@@ -0,0 +1,24 @@
+name: Delete old workflow runs
+on:
+    workflow_dispatch:
+        inputs:
+            days:
+                description: "Number of days."
+                required: true
+                default: 7
+            minimum_runs:
+                description: "The minimum runs to keep for each workflow."
+                required: true
+                default: 5
+
+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: ${{ github.event.inputs.days }}
+                  keep_minimum_runs: ${{ github.event.inputs.minimum_runs }}