Change to bmi-example-fortran directory

Author: mdpiper

.github/workflows/test.yml

@@ -33,9 +33,10 @@ jobs:
 
       - name: Build and install HeatModelF
         run: |
-          working-directory: ${{ github.workspace }}/external/bmi-example-fortran
+          pushd ./external/bmi-example-fortran
           cmake -B ${{ env.BUILD_DIR }} -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX
           cmake --build ${{ env.BUILD_DIR }} --target install --config Release
+          popd
 
       - name: Build and install package
         run: |