Fix permissions

Author: gwenn

.github/workflows/cmake-single-platform.yml

@@ -8,6 +8,9 @@ on:
   pull_request:
     branches: [ "master" ]
 
+permissions:
+  contents: read
+
 env:
   # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
   BUILD_TYPE: Debug