CI: Deploy PRs to staging

.forgejo/workflows/cleanup.yaml

@@ -0,0 +1,19 @@
+on:
+  pull_request:
+  pull_request_target:
+    - closed
+
+jobs:
+  cleanup-staging:
+    runs-on: docker
+    container:
+      image: code.forgejo.org/oci/node:20-bookworm
+    steps:
+      - name: Pipeline info PR
+        run: |
+          echo "PR#${{ github.event.pull_request.number }} ${{ github.event.action }}"
+
+      - name: Deploy - Remove PR from staging
+        if: github.event.action == 'closed'
+        run: |
+          ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts' ccchh-website-deploy@public-web-static-intern.hamburg.ccc.de -t "rm -r /var/www/next.hamburg.ccc.de/pr${{ github.event.pull_request.number }}/"