Merge pull request Azure#51 from Azure/optimise-action

chore: Do not build docs when destroying preview url on PR close

Author: waelkdouh

.github/workflows/preview-docs.yml

@@ -34,6 +34,7 @@ jobs:
           echo "SOURCE_BRANCH=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
           echo "SOURCE_TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
       - name: Build workshop site
+        if: github.event.action != "closed"
         run: |
           echo "GIT_PYTHON_REFRESH=quiet"
           make build-docs-website