Add requirements

.github/workflows/python-package.yml

@@ -25,10 +25,8 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest poetry
-        if [ -f pyproject.toml ]; then poetry install; fi
-    - name: Check if lock file is up-to-date
-      run: |
-        poetry check
+        poetry export -f requirements.txt --output requirements.txt
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics