Set PREFIX environment variable

Author: mdpiper

.github/workflows/test.yml

@@ -74,18 +74,22 @@ jobs:
           micromamba-version: latest
           environment-file: environment.yml
 
-      - name: Set the FC environment variable to the Fortran conda compiler
+      - name: Set the PREFIX environment variable
         run: |
-          echo "FC=C:\Users\runneradmin\micromamba\envs\fbld\Library\bin\flang.exe" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          echo "PREFIX=$env:MAMBA_ROOT_PREFIX\envs\fbld" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+
+      - name: Set the FC environment variable
+        run: |
+          echo "FC=$env:PREFIX\Library\bin\flang.exe" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
 
       - name: View environment variables
         run: |
           ls env:
 
       - name: Configure, build, and install HeatModelF
         run: |
-          cmake ./external/bmi-example-fortran -B ${{ env.BUILD_DIR }} -LA -G Ninja -DCMAKE_INSTALL_PREFIX=$env:CONDA_PREFIX -DCMAKE_BUILD_TYPE=Release
-          cmake --build ${{ env.BUILD_DIR }} --target install --config Release
+          cmake ./external/bmi-example-fortran -B $env:BUILD_DIR -LA -G Ninja -DCMAKE_INSTALL_PREFIX=$env:PREFIX -DCMAKE_BUILD_TYPE=Release
+          cmake --build $env:BUILD_DIR --target install --config Release
 
       - name: Build and install package
         run: |