ci: Cleanup old workflow runs (#364)

.github/workflows/cleanup.yml

@@ -0,0 +1,46 @@
+name: "Cleanup"
+on:
+  workflow_dispatch:
+    inputs:
+      days:
+        description: 'Retain days'
+        required: true
+        default: 30
+      minimum_runs:
+        description: 'Minimum runs to keep for each workflow'
+        required: true
+        default: 6
+      delete_workflow_pattern:
+        description: 'Name/filename of workflow. Default is all.'
+        required: false
+      delete_workflow_by_state_pattern:
+        description: 'Remove workflow by state: active, deleted, disabled_fork, disabled_inactivity, disabled_manually'
+        required: true
+        default: "All"
+        type: choice
+        options:
+          - "All"
+          - active
+          - deleted
+          - disabled_inactivity
+          - disabled_manually
+      dry_run:
+        description: 'Dry run?'
+        required: false
+
+jobs:
+
+  del-runs:
+    name: "Delete old workflow runs"
+    runs-on: ubuntu-latest
+
+    steps:
+      - 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 }}
+          delete_workflow_pattern: ${{ github.event.inputs.delete_workflow_pattern }}
+          delete_workflow_by_state_pattern: ${{ github.event.inputs.delete_workflow_by_state_pattern }}
+          dry_run: ${{ github.event.inputs.dry_run }}