fix(next): correct GitHub workflow branch condition

Author: dgraf-gh

.github/workflows/main.yml

@@ -55,7 +55,7 @@ jobs:
             ghcr.io/${{ github.repository }}
           tags: |
             type=raw,value=develop,enable={{is_default_branch}}
-            type=raw,value=next,enable=${{ branch == 'next' }}
+            type=raw,value=next,enable=${{ github.ref_name == 'next' }}
       - name: Build and push
         uses: docker/build-push-action@v6
         with: