Fix GitHub CI

Author: jonpas

.github/workflows/cpp.yml

@@ -29,7 +29,7 @@ jobs:
         mkdir -p build
         cd build
         cmake --version
-        cmake .. $CMAKE_ARGS -DIDICMAKE_PLATFORM_CONFIG=../platform-config.$TYPE.cmake
+        cmake .. $CMAKE_ARGS -DIDICMAKE_PLATFORM_CONFIG=../platform-config.${{ matrix.type }}.cmake
     - name: Build
       shell: bash
       run: |