Update .github/workflows/copilot-setup-steps.yml

Co-authored-by: Copilot <[email protected]>

Author: ericstj

.github/workflows/copilot-setup-steps.yml

@@ -20,4 +20,4 @@ jobs:
       - name: Restore solution
         run: ./build.sh --restore --excludecibinarylog --warnaserror false /p:BuildAllConfigurations=true /p:DotNetBuildAllRuntimePacks=true
       - name: Put dotnet on the path
-        run: export PATH=$PWD/.dotnet:$PATH
+        run: echo "PATH=$PWD/.dotnet:$PATH" >> $GITHUB_ENV