adding poetry and caching to actions build

.github/workflows/github-actions.yml

@@ -4,22 +4,55 @@ on: [push, pull_request]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+
       - name: Set up Python 3.9
         uses: actions/setup-python@v2
         with:
           python-version: 3.9
-      - name: Install dependencies
+
+      - name: Get full Python version
+        id: full-python-version
+        shell: bash
+        run: echo ::set-output name=version::$(python -c "import sys; print('-'.join(str(v) for v in sys.version_info))")
+
+      - name: Bootstrap poetry
+        shell: bash
         run: |
-          python -m pip install --upgrade pip
+          curl -sL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py \
-          pip install -r requirements.txt
+            | python - -y 
-          pip install -r requirements_dev.txt
+
+      - name: Update PATH
+        if: ${{ matrix.os != 'Windows' }}
+        shell: bash
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: Configure poetry
+        shell: bash
+        run: poetry config virtualenvs.in-project true
+
+      - name: Set up cache
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
+
+      - name: Ensure cache is healthy
+        if: steps.cache.outputs.cache-hit == 'true'
+        shell: bash
+        run: timeout 10s poetry run pip --version || rm -rf .venv
+
+      - name: Install dependencies
+        shell: bash
+        run: poetry install
+
       - name: Run precommit
         run: |
           pre-commit run --all-files
-      - name: Test with unittest
+
-        run: |
+      - name: Test with pytest
-          python -m unittest tests/*.py
+        shell: bash
+        run: poetry run test