chore: add cname in ci

.github/workflows/deploy-docs.yml

@@ -48,6 +48,9 @@ jobs:
         run: |
           rm -rf docs
           mv apps/docs/doc_build docs
+      - name: Add CNAME
+        run: |
+          echo "flowgram.ai" > ./docs/CNAME
       - name: Push code
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}