attempt to upgrade CI to use pdm

Author: Technologicat

.github/workflows/coverage.yml

@@ -27,10 +27,13 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install flake8
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        pip install pdm
+        pdm python install ${{ matrix.python-version }}
+        pdm install
     - name: Generate coverage report
       run: |
         pip install coverage
+        $(pdm venv activate)
         coverage run --source=. -m runtests
         coverage xml
     - name: Upload coverage to Codecov

.github/workflows/python-package.yml

@@ -29,7 +29,9 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install flake8
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        pip install pdm
+        pdm python install ${{ matrix.python-version }}
+        pdm install
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
@@ -38,4 +40,5 @@ jobs:
         flake8 . --config=flake8rc --count --exit-zero --max-complexity=100 --max-line-length=127 --statistics
     - name: Test with unpythonic.test.fixtures
       run: |
+        $(pdm venv activate)
         python runtests.py