Deploy docusaurus branch to Vercel

Author: ltm

.github/workflows/ci.yml

@@ -20,3 +20,9 @@ jobs:
         run: |
           npm ci
           npm run build
+      - name: vercel deploy
+        if: ${{ github.ref == 'refs/heads/docusaurus' }}
+        run: vercel deploy --prod
+        env:
+          VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}