ci: improve test workflow performance (#333)

* ci: speed up by using uv to install python packages

* ci: run tests in parallel using pytest-xdist

.github/workflows/test.yml

@@ -81,13 +81,14 @@ jobs:
 
     - name: Install package and dependencies
       run: |
-        python -m pip install "$(ls dist/*.whl)[dev,solvers]"
+        python -m pip install uv
+        uv pip install --system "$(ls dist/*.whl)[dev,solvers]"
 
     - name: Test with pytest
       env:
         MOSEKLM_LICENSE_FILE: ${{ secrets.MSK_LICENSE }}
       run: |
-        pytest --cov=./ --cov-report=xml linopy --doctest-modules test
+        pytest --cov=./ --cov-report=xml linopy --doctest-modules test --numprocesses=auto --dist=loadscope
 
     - name: Upload code coverage report
       if: matrix.os == 'ubuntu-latest'

pyproject.toml

@@ -56,6 +56,7 @@ docs = [
 dev = [
     "pytest",
     "pytest-cov",
+    "pytest-xdist",
     "netcdf4",
     "pre-commit",
     "paramiko",