CI: update build mechanism

.github/workflows/build_and_test.yml

@@ -28,27 +28,23 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Create virtual environment
-        run: python -m venv venv
+      - name: Cache poetry install
+        uses: actions/cache@v2
+        with:
+          path: ~/.local
+          key: poetry-1.3.1
 
-      - name: Activate virtual environment
-        run: |
-          ls
-          source ./venv/bin/activate
+      - uses: snok/install-poetry@v1
+        with:
+          version: 1.3.1
+          virtualenvs-create: true
+          virtualenvs-in-project: true
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
-          python -m pip install flake8 pytest
-          if [ -f .github/workflows/requirements.txt ]; then pip install -r .github/workflows/requirements.txt; fi
+          poetry install --with dev
 
-      - name: Lint with flake8
-        run: |
-          # stop the build if there are Python syntax errors or undefined names
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude=venv
-          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 . --count --exit-zero --exclude=venv --max-complexity=10 --max-line-length=127 --statistics
       - name: Test with pytest
         run: |
           python -m spacy download en_core_web_sm
-          pytest 
+          poetry run task test