use a venv

Author: infothrill

.github/workflows/tests.yml

@@ -17,7 +17,11 @@ jobs:
       - name: Install dependencies
         run: |
           python3 --version
+          python3 -m venv $HOME/venv
+          source $HOME/venv/bin/activate
           python3 -m pip install --upgrade pip
-          pip3 install --break-system-packages tox
+          pip3 install tox
       - name: Test with tox
-        run: tox -e py,style
+        run: |
+          source $HOME/venv/bin/activate
+          tox -e py,style