Merge pull request #590 from boriel/bugfix/fix_arch_backend_initialization

Bugfix/fix arch backend initialization

Author: boriel

.github/workflows/python-app.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Set up Python 3.8
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.8.7
     - name: Caches pip
       uses: actions/cache@v1
       with:
@@ -30,7 +30,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install poetry tox
+        pip install poetry
         poetry install
     - name: Cache tox environments
       id: cache-tox
@@ -42,6 +42,5 @@ jobs:
         # only takes a single file path or pattern at the moment.
         key: ${{ runner.os }}-${{ matrix.python }}-tox-${{ hashFiles('setup.cfg') }}-${{ hashFiles('pyproject.toml') }}
 
-
     - name: Run Tox
-      run: tox -- --no-cov
+      run: poetry run tox -- --no-cov