Specify directory for dotnet to install to and execute from

Author: Arlodotexe

.github/workflows/build.yml

@@ -18,6 +18,8 @@ on:
 
 env:
   DOTNET_VERSION: ${{ '8.0.201' }}
+  DOTNET_INSTALL_DIR: dotnet-install
+  DOTNET_ROOT: dotnet-install
   ENABLE_DIAGNOSTICS: false
   #COREHOST_TRACE: 1
   MSBUILD_VERBOSITY: normal