🚇 Run pytest and pip as python module with 'python -m'

This prevents and esoteric CI bug

.github/workflows/CI_CD_actions.yml

@@ -55,7 +55,7 @@ jobs:
         run: |
           conda install -y pandoc
           python -m pip install -U pip wheel
-          pip install .
+          python -m pip install .
           python -m pip install -U -r docs/requirements.txt
       - name: Show installed packages
         run: pip freeze
@@ -80,7 +80,7 @@ jobs:
         run: |
           conda install -y pandoc
           python -m pip install -U pip wheel
-          pip install .
+          python -m pip install .
           python -m pip install -U -r docs/requirements.txt
       - name: Show installed packages
         run: pip freeze
@@ -106,10 +106,10 @@ jobs:
           python -m pip install -U -r requirements_dev.txt
           pip install .
       - name: Show installed packages
-        run: pip freeze
+        run: python -m pip freeze
       - name: Build docs
         run: |
-          py.test -vv --nbval docs/source/notebooks
+          python -m pytest -vv --nbval docs/source/notebooks
 
   test:
     runs-on: ${{ matrix.os }}
@@ -129,12 +129,12 @@ jobs:
         run: |
           python -m pip install --upgrade pip wheel
           python -m pip install -r requirements_dev.txt
-          pip install -e .
+          python -m pip install -e .
       - name: Show installed packages
-        run: pip freeze
+        run: python -m pip freeze
       - name: Run tests
         run: |
-          pytest --cov=./ --cov-report term --cov-report xml --cov-config pyproject.toml glotaran
+          python -m pytest --cov=./ --cov-report term --cov-report xml --cov-config pyproject.toml glotaran
 
       - name: Codecov Upload
         uses: codecov/codecov-action@v3