feat(job): create python_tox job

## Objective

Tox aims to automate and standardize testing in Python. It is part of a larger vision of easing the packaging, testing and release process of Python software.

## How to use it

1. Ensure that your project have

   [`tox.ini`](https://tox.wiki/en/latest/){:target="_blank"} 

   file

1. Add this job URL inside the `include` list of your `.gitlab-ci.yml` file (see the [quick setup](/use-the-hub/#quick-setup)). You can specify [a fixed version](#changelog) instead of `latest`.

    ```yaml

      - remote: 'https://jobs.r2devops.io/latest/python_tox.yml'

    ```

1. If you need to customize the job (stage, variables, ...) 👉 check the [jobs

   customization](/use-the-hub/#jobs-customization)

1. Well done, your job is ready to work ! 😀

## Job details

* Job name: `python_tox`

* Docker image:

[`vicamo/pyenv:slim-focal`](https://hub.docker.com/r/vicamo/pyenv)

* Default stage: `static_tests`

* When: `always`

### Variables

| Name | Description | Default |

| ---- | ----------- | ------- |

| `PROJECT_ROOT` <img width=100/> | Relative to root of your repository, it is the path to your python project <img width=175/>| `.` <img width=100/>|

| `PYTHON_ENV` | Restrict the test to run on a specific environnement of Python, if none is specified `Tox` will run the test on all environnement listed in the `tox.ini` file. | ` ` |

| `ADDITIONAL_OPTIONS` | [Additional options](https://tox.wiki/en/latest/config.html?result-json#tox) for tox command | ` ` |

name: python_tox

description: A ready-to-use Tox job to test your Python project

default_stage: static_tests

icon: 🐍

maintainer: alexiaognard

license: Apache-2.0

images:

  vicamo/pyenv:slim-focal

tools:

labels:

  - GitLab

  - Python

  - Testing

  - Tox

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# Job from R2Devops hub --> r2devops.io

stages:

  - static_tests

python_tox:

  image:

    name: vicamo/pyenv:slim-focal

    entrypoint: [""]

  stage: static_tests

  variables:

    PROJECT_ROOT: "."

    PYTHON_ENV: ""

    ADDITIONAL_OPTIONS: ""

  script:

    - cd $PROJECT_ROOT

        # Install tox

    - pip install tox

    - if [[ (${PYTHON_ENV} != "") ]]; then PYTHON_ENV="-e $PYTHON_ENV"; else PYTHON_ENV=""; fi

    - tox $PYTHON_ENV $ADDITIONAL_OPTIONS

* Initial version

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