mpi4py: enable spawn tests workflow by default

The previous inter-communicator race condition has been fixed. Enable the
workflow by default to catch new regressions.

Signed-off-by: Wenduo Wang <wenduwan@amazon.com>

Author: wenduwan

.github/workflows/ompi_mpi4py.yaml

@@ -16,9 +16,11 @@ on:
         type: string
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
     timeout-minutes: 30
+    env:
+      MPI4PY_TEST_SPAWN: true
     steps:
     - name: Configure hostname
       run:  echo 127.0.0.1 `hostname` | sudo tee -a /etc/hosts > /dev/null
@@ -105,43 +107,51 @@ jobs:
         repository: ${{ inputs.repository || 'mpi4py/mpi4py' }}
         ref: ${{ inputs.ref }}
 
-    - name: Build mpi4py wheel
-      run:  python -m pip wheel .
+    - name: Install mpi4py
+      run:  python -m pip install .
       env:
         CFLAGS: "-O0"
 
-    - name: Save the artifacts for other jobs
-      uses: actions/upload-artifact@v4
-      with:
-        path: |
-          /opt/openmpi
-          ~/.openmpi
-          ~/.prte
-          test
-          demo
-          mpi4py-*.whl
-        retention-days: 2
-        name: build-artifacts
-
-  #==============================================
-
-  run_defaults:
-    # This whole set of tests run with mpi4py's defaults.  As of March
-    # 2024, this means disabling the spawn and dynamic tests.  We want
-    # this job of tests to pass.
-    needs: [ build ]
-    uses: ./.github/workflows/ompi_mpi4py_tests.yaml
-
-  #==============================================
-
-  run_spawn:
-    # This whole set of tests runs explicitly with setting "enable the
-    # spawn tests".  As of March 2024, we know that Open MPI is
-    # failing these tests.
-    needs: [ build ]
-    # Only run if the label "mpi4py" is set on this PR.
-    if: ${{ contains(github.event.pull_request.labels.*.name, 'mpi4py-all') }}
-    uses: ./.github/workflows/ompi_mpi4py_tests.yaml
-    with:
-      # Enable the spawn tests
-      env_name: MPI4PY_TEST_SPAWN
+    - name: Test mpi4py (singleton)
+      run:  python test/main.py -v
+      if:   ${{ true }}
+      timeout-minutes: 10
+    - name: Test mpi4py (np=1)
+      run:  mpiexec -n 1 python test/main.py -v
+      if:   ${{ true }}
+      timeout-minutes: 10
+    - name: Test mpi4py (np=2)
+      run:  mpiexec -n 2 python test/main.py -v -f
+      if:   ${{ true }}
+      timeout-minutes: 10
+    - name: Test mpi4py (np=3)
+      run:  mpiexec -n 3 python test/main.py -v -f
+      if:   ${{ true }}
+      timeout-minutes: 10
+    - name: Test mpi4py (np=4)
+      run:  mpiexec -n 4 python test/main.py -v -f
+      if:   ${{ true }}
+      timeout-minutes: 10
+    - name: Test mpi4py (np=5)
+      run:  mpiexec -n 5 python test/main.py -v -f
+      if:   ${{ true }}
+      timeout-minutes: 10
+
+    - name: Test mpi4py.run
+      run:  python demo/test-run/test_run.py -v
+      if:   ${{ true }}
+      timeout-minutes: 10
+
+    - name: Relocate Open MPI installation
+      run:  mv /opt/openmpi /opt/ompi
+    - name: Update PATH and set OPAL_PREFIX and LD_LIBRARY_PATH
+      run: |
+        sed -i '\|/opt/openmpi/bin|d' $GITHUB_PATH
+        echo OPAL_PREFIX=/opt/ompi >> $GITHUB_ENV
+        echo LD_LIBRARY_PATH=/opt/ompi/lib >> $GITHUB_ENV
+
+    - name: Test mpi4py (singleton)
+      run:  python test/main.py -v
+      if:   ${{ true }}
+      timeout-minutes: 10
+