add testing

.github/workflows/bldtest.yml

@@ -0,0 +1,25 @@
+name: mpi-serial
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the main branch
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+  steps:
+    - uses: actions/checkout@v3
+    - id: load-env
+      run:
+        sudo apt-get update
+        sudo apt-get install gfortran
+        sudo apt-get install autoconf
+
+    - name: Build mpi-serial
+      run: |
+        cd mpi-serial
+        configure
+        make