Use Poetry custom installer in GitHub Actions

python-poetry/poetry#366 (comment)
https://gist.github.com/br3ndonland/f9c753eb27381f97336aa21b8d932be6

.github/workflows/tests.yml

@@ -25,10 +25,13 @@ jobs:
           path: ~/.cache/pypoetry
           key: ${{ runner.os }}-poetry-${{ hashFiles('**/poetry.lock') }}
           restore-keys: ${{ runner.os }}-poetry-
-      - name: Install dependencies
+      - name: Install Poetry
         run: |
-          python -m pip install poetry
-          poetry install
+          curl -fsS -o get-poetry.py https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py
+          python get-poetry.py -y
+          echo "$HOME/.poetry/bin" >> $GITHUB_PATH
+      - name: Install dependencies
+        run: poetry install --no-interaction
         env:
           POETRY_VIRTUALENVS_CREATE: false
       - name: Run unit tests