Fix for Windows

Author: matthewdouglas

.github/workflows/test-runner.yml

@@ -133,6 +133,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set build environment variables
+        shell: bash
         run: |
           echo "build_os=${{ steps.config.outputs.build_os }}" >> $GITHUB_ENV
           echo "build_arch=${{ steps.config.outputs.arch }}" >> $GITHUB_ENV