try to get intelmpi working

Author: simonbyrne

.github/workflows/UnitTests.yml

@@ -211,8 +211,8 @@ jobs:
     runs-on: ubuntu-18.04  # 20.04 not supported
 
     env:
-      JULIA_MPI_BINARY: system
-      JULIA_MPI_PATH: /home/runner/intel/compilers_and_libraries_2020.4.304/linux/mpi/intel64
+      JULIA_MPI_TEST_BINARY: system
+      JULIA_MPI_TEST_ABi: MPICH
 
     steps:
     - name: Checkout
@@ -256,11 +256,17 @@ jobs:
         using Pkg
         Pkg.develop(path="lib/MPIPreferences")
 
-    # we can't use the usual actions here as we need to ensure the environment variables are set
-    - name: "Build package"
+    - name: add MPIPreferences, use system
       run: |
         source ${HOME}/intel/compilers_and_libraries/linux/mpi/intel64/bin/mpivars.sh release
-        julia --project -e 'using Pkg; Pkg.instantiate(verbose=true); Pkg.build(verbose=true)'
+        julia --color=yes --project=test -e '
+          using Pkg
+          Pkg.develop(path="lib/MPIPreferences")
+          using MPIPreferences
+          MPIPreferences.use_system_binary(export_prefs=true)
+          rm("test/Manifest.toml")'
+
+    # we can't use the usual actions here as we need to ensure the environment variables are set
     - name: "Run tests"
       run: |
         source ${HOME}/intel/compilers_and_libraries/linux/mpi/intel64/bin/mpivars.sh release
@@ -308,6 +314,7 @@ jobs:
         Pkg.develop(path="lib/MPIPreferences")
         using MPIPreferences
         MPIPreferences.use_system_binary(export_prefs=true)
+        rm("test/Manifest.toml")
 
     - uses: julia-actions/julia-runtest@latest