CI/TST: Use editable install for ease of test coverage

Using pyargs and normal installs causes multiple numpy
installations to be found. We can work around this with
an editable local install and letting coverage pick up our local
source directory structure.

Author: greglucas

.github/workflows/tests.yml

@@ -64,12 +64,13 @@ jobs:
     - name: Install pymsis
       run: |
         python -m pip install --upgrade pip
-        python -m pip install -v .[test]
+        python -m pip install meson-python ninja numpy
+        # Need to install the package in editable mode for coverage
+        python -m pip install -v --no-build-isolation -e .[test]
 
     - name: Test with pytest
       run: |
-        # TODO: Get coverage for other modules without specifying pymsis.msis directly
-        pytest --color=yes --cov=pymsis.msis --cov pymsis.utils --cov-report=xml --pyargs pymsis
+        pytest --color=yes --cov --cov-report=xml
 
     - name: Upload code coverage
       uses: codecov/codecov-action@v5