chore: Add deploy preview alias for readable preview URLs

Author: ongdisheng

.github/workflows/preview-docs.yml

@@ -59,6 +59,7 @@ jobs:
           enable-pull-request-comment: true
           enable-commit-comment: false
           enable-github-deployment: false
+          alias: deploy-preview-${{ github.event.number }}
         env:
           NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
           NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}