Set anaconda_upload when pushing a stable branch

Author: ssun30

.github/workflows/conda_build.yml

@@ -49,6 +49,7 @@ jobs:
 
           # Conditionally add the --token and --user flags for stable branches
           if [[ "${GITHUB_REF}" == "refs/heads/fix_conda_build" ]]; then
+            mamba config --set anaconda_upload yes
             conda-build --token "$CONDA_TOKEN" --user rmg .conda
           else      
             conda-build .conda