Add install poetry step to ci

.github/workflows/checks.yml

@@ -37,18 +37,38 @@ jobs:
         key: ${{ runner.os }}-pip-${{ hashFiles('requirements/*.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
-    - name: Install Dependencies
+
+    - name: Install Poetry
+      uses: snok/install-poetry@v1
+      with:
+        version: latest
+        virtualenvs-create: true
+        virtualenvs-in-project: true
+        installer-parallel: true
+
+    - name: Cache poetry dependencies
+      id: cached-poetry-dependencies
+      uses: actions/cache@v3
+      with:
+        path: .venv
+        key: ${{ runner.os }}-poetry-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}
+
+    - name: Install Django
       run: |
         pip install 'django${{ matrix.django-version }}'
+
     - name: Prepare env
       run: |
         inv ci.prepare
+
     - name: Run checks ${{ matrix.python-version }}
       run: inv pre-commit.run-hooks
+
     - name: Upload results to coveralls
       run: |
         pip install coveralls
         coveralls --service=github
+
       env:
         COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}