ci: Remove docs preview when PR is closed

.github/workflows/pr-closed.yml

@@ -0,0 +1,27 @@
+name: PR Closed
+
+on:
+  pull_request:
+    branches: [main, next]
+    types: [closed]
+
+jobs:
+  docs:
+    name: Remove Docs Preview
+    runs-on: ubuntu-latest
+    steps:
+      - name: Teardown
+        uses: adrianjost/actions-surge.sh-teardown@v1.0.3
+        with:
+          regex: pr-${{ github.event.number }}--ruma-docs.surge.sh
+        env:
+          SURGE_LOGIN: ${{ secrets.SURGE_LOGIN }}
+          SURGE_TOKEN: ${{ secrets.SURGE_TOKEN }}
+      
+      - name: Remove preview URL
+        uses: Beakyn/gha-comment-pull-request@v1.0.2
+        id: deploy-preview
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          description-message: Preview removed