add clean up script again (remove later)

.github/workflows/clean-up.yml

@@ -0,0 +1,20 @@
+# GitHub Action to remove old artifacts
+# Documentation: https://github.com/c-hive/gha-remove-artifacts
+
+name: clean-up
+
+on:
+  schedule:
+    # Every day at 1am
+    - cron: '0 1 * * *'
+
+jobs:
+  remove-old-artifacts:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+    - name: Remove old artifacts
+      uses: c-hive/gha-remove-artifacts@v1
+      with:
+        age: '1 hour'