Update cmake-multi-platform.yml

Author: sam-astro

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

@@ -15,6 +15,8 @@ jobs:
     strategy:
       # Set fail-fast to false to ensure that feedback is delivered for all matrix combinations. Consider changing this to true when your workflow is stable.
       fail-fast: false
+      build-dir: ./dcc_client/out-linux
+      source-dir: ./dcc_client
 
       # Set up a matrix to run the following 3 configurations:
       # 1. <Windows, Release, latest MSVC compiler toolchain on the default runner image, default generator>