WIP: Add script to build Django API

[ai]

@egregors I made added calling make venv && make install and make venv && make docs to the build script.

This PR can help you reproduce the API error on CI.

[ai]

@egregors I still locally has this error:

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/config.py", line 361, in eval_config_file
    execfile_(filename, namespace)
  File "/usr/lib/python3.8/site-packages/sphinx/util/pycompat.py", line 81, in execfile_
    exec(code, _globals)
  File "/home/ai/Dev/logux-django/docs/conf.py", line 21, in <module>
    django.setup()
  File "/home/ai/.local/lib/python3.8/site-packages/django/__init__.py", line 19, in setup
    configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
  File "/home/ai/.local/lib/python3.8/site-packages/django/conf/__init__.py", line 79, in __getattr__
    self._setup(name)
  File "/home/ai/.local/lib/python3.8/site-packages/django/conf/__init__.py", line 66, in _setup
    self._wrapped = Settings(settings_module)
  File "/home/ai/.local/lib/python3.8/site-packages/django/conf/__init__.py", line 157, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/lib64/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'tests'

It is the last task in Django docs =^_^=

[egregors]

I still locally has this error:

I'll check it ASAP 👌