Use an absolute path to flang

.github/workflows/test.yml

@@ -76,7 +76,7 @@ jobs:
 
       - name: Set the FC environment variable to the Fortran conda compiler
         run: |
-          echo "FC=flang.exe" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          echo "FC=C:\Users\runneradmin\micromamba\envs\fbld\Library\bin\flang.exe" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
 
       - name: Build and install HeatModelF
         run: |