[WIP] Run tests as part of the CI process

.github/workflows/test_suite_ubuntu.yml

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+# Workflow to run CAM-ML test suite
+name: TestSuiteUbuntu
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on pushes to the "main" branch, i.e., PR merges
+  push:
+    branches: [ "main" ]
+
+  # Triggers the workflow on pushes to open pull requests with code changes
+  pull_request:
+    paths:
+      - '.github/workflows/test_suite_ubuntu.yml'
+      - '**.c'
+      - '**.cpp'
+      - '**.fypp'
+      - '**.f90'
+      - '**.F90'
+      - '**.pf'
+      - '**.py'
+      - '**.sh'
+      - '**CMakeLists.txt'
+      - '**requirements.txt'
+      - '**data/*'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Cancel jobs running if new commits are pushed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+# Workflow run - one or more jobs that can run sequentially or in parallel  
+jobs:
+  # This workflow contains a single job called "test-suite-ubuntu"
+  test-suite-ubuntu:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        std: ["f2008", "f2018"]
+
+    # These steps represent sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout code
+        with:
+          persist-credentials: false
+        uses: actions/checkout@v4
+
+      - name: Install Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      # MPI is required by pFUnit
+      - name: Install an MPI distribution
+        run: |
+          sudo apt update
+          sudo apt install mpich
+
+      - name: Install pFUnit
+        run: |
+          export FC=/usr/bin/gfortran
+          export MPIF90=/usr/bin/mpif90
+          git clone -b v4.10.0 https://github.com/Goddard-Fortran-Ecosystem/pFUnit.git
+          mkdir pFUnit/build
+          cd pFUnit/build
+          cmake ..
+          make -j 4 install