install tox into the venv (#483)

* install tox into the venv

* Update config.yml

.circleci/config.yml

@@ -32,7 +32,7 @@ jobs:
           image: <<parameters.image>>
       - docker-run:
           image: <<parameters.image>>
-          command: /venv/bin/tox -e <<parameters.toxenv>>
+          command: /venv/bin/pip install tox && /venv/bin/tox -e <<parameters.toxenv>>
   linux-arm64-wheel:
     machine:
       image: ubuntu-2004:current

.github/workflows/ci.yml

@@ -152,6 +152,7 @@ jobs:
             ~/.cargo/git/db/
             src/_bcrypt/target/
           key: ${{ runner.os }}-${{ matrix.IMAGE.IMAGE }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - run: /venv/bin/pip install tox
       - run: '/venv/bin/tox'
         env:
           TOXENV: ${{ matrix.IMAGE.TOXENV }}