Split workflows by OS, add Fortran setup for Windows

.github/workflows/python_testing.yml → .github/workflows/python_testing_linux.yml

@@ -1,4 +1,4 @@
-name: Python package unit testing
+name: Python package unit testing (Linux)
 
 on: [push, pull_request]
 

.github/workflows/python_testing_windows.yml

@@ -0,0 +1,30 @@
+name: Python package unit testing (Linux)
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Setup GNU Fortran
+      uses: modflowpy/install-gfortran-action@v1
+    - name: Install dependencies
+      run: |
+        python -m pip install .
+        pip install pytest
+    - name: Run unit tests
+      run: |
+        cd trustregion/tests
+        python -m pytest