Use poetry in github workflows instead of pip.

.github/workflows/run_tests.yml

@@ -21,12 +21,30 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
+      # install & configure poetry
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+          installer-parallel: true
+
+      # load cached venv if cache exists
+      - name: Load cached venv
+        id: cached-poetry-dependencies
+        uses: actions/cache@v3
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+
+      # install dependencies if cache does not exist
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install pytest mypy codecov pytest-cov pandas
-          pip install plotnine matplotlib scipy scikit-learn
-          pip install lightgbm pyarrow black isort dill
+        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+        run: poetry install --no-interaction --no-root
+
+      # install root project
+      - name: Install project
+        run: poetry install --no-interaction --with dev
 
       - name: MyPy Checks
         run: mypy miceforest --ignore-missing-imports