fix: only try to deploy if we're on v2 branch

Author: gadomski

.github/workflows/ci.yaml

@@ -55,6 +55,7 @@ jobs:
           path: site/
   deploy-docs:
     name: Deploy docs
+    if: github.ref == 'refs/heads/v2'
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}