fix: helm release should run only on main

.github/workflows/helm.yml

@@ -79,6 +79,7 @@ jobs:
 
       - name: Run chart-releaser
         uses: helm/chart-releaser-action@v1.2.0
+        if: github.ref == 'refs/heads/main'
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
           CR_RELEASE_NAME_TEMPLATE: "helm-chart-{{ .Version }}"