fix condition cuda tests

Author: rflamary

.github/workflows/build_tests_cuda.yml

@@ -12,7 +12,7 @@ jobs:
   linux-cuda:
 
     runs-on: pc-cuda
-    if: github.event.review.state == 'approved' || github.event_name ==     'workflow_dispatch' || (github.event_name == 'push' && github.event.branch == 'master')
+    if: github.event.review.state == 'approved' || github.event_name ==     'workflow_dispatch' || (github.event_name == 'push' && github.ref == 'refs/heads/master')
 
     steps:
     - uses: actions/checkout@v1