added cleanup workflow

.github/workflows/cleanup.yaml

@@ -0,0 +1,18 @@
+name: Cleanup Deployment History
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    permissions: write-all
+    steps:
+      - name: Delete deployment history
+        uses: strumwolf/delete-deployment-environment@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          environment: Preview
+          onlyRemoveDeployments: true