chore: fix netlify deploy command (#2581)

Author: bennypowers

.github/workflows/preview.yml

@@ -30,7 +30,12 @@ jobs:
         env:
           NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
           NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
-        run: npx netlify-cli deploy --alias=deploy-preview-${{github.event.number}} --dir=_site
+          NETLIFY_DEPLOY_ALIAS: deploy-preview-${{github.event.number}}
+        run: >
+              npx netlify-cli deploy
+              --dir _site
+              --filter @patternfly/elements
+              --alias $NETLIFY_DEPLOY_ALIAS
 
       - name: Post Previews
         uses: actions/github-script@v6