Fix deployment branch condition

Author: nhannguyen-visma

.github/workflows/deploy.yml

@@ -48,6 +48,8 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     needs: build
+    # Only deploy from main branch
+    if: github.ref == 'refs/heads/main'
     steps:
       - name: Deploy to GitHub Pages
         id: deployment