Always trigger CI on CMakeList changes

Thanks to @secretdataz

.github/workflows/build_servers_cmake.yml

@@ -18,6 +18,8 @@ on:
       # This workflow should run when a file in a source directory has been modified.
       - 'src/**'
       - '3rdparty/**'
+      # This workflow should run whenever a CMake related file has been modified
+      - '**/CMakeLists.txt'
 
 jobs:
   build: