Allow config/g3w-suite/overrides/static usage while developing

[Raruto]

As per v3.4 it is only possible to override templates (ref: #58):

g3w-suite-docker/docker-compose-dev.yml

Line 69 in c37f17d

- ./config/g3w-suite/overrides/templates:/code/templates:ro

during development it would also be handy to allow overriding of static files, as it already happens for the docker-compose.yml file:

g3w-suite-docker/docker-compose.yml

Line 81 in c37f17d

- ./config/g3w-suite/overrides/static:/shared-volume/static/overrides:ro

[Raruto]

Maybe related to:

g3w-suite/g3w-admin@fb45e5d

Usage info:

cd /code/g3w-admin/

python3 manage.py collectstatic --help

usage: manage.py collectstatic [-h] [--noinput] [--no-post-process] [-i PATTERN] [-n] [-c] [-l] [--no-default-ignore] [--version] [-v {0,1,2,3}] [--settings SETTINGS]
                               [--pythonpath PYTHONPATH] [--traceback] [--no-color] [--force-color]

Collect static files in a single location.

optional arguments:
  -h, --help            show this help message and exit
  --noinput, --no-input
                        Do NOT prompt the user for input of any kind.
  --no-post-process     Do NOT post process collected files.
  -i PATTERN, --ignore PATTERN
                        Ignore files or directories matching this glob-style pattern. Use multiple times to ignore more.
  -n, --dry-run         Do everything except modify the filesystem.
  -c, --clear           Clear the existing files using the storage before trying to copy or link the original file.
  -l, --link            Create a symbolic link to each file instead of copying.
  --no-default-ignore   Don't ignore the common private glob-style patterns (defaults to 'CVS', '.*' and '*~').
  --version             show program's version number and exit
  -v {0,1,2,3}, --verbosity {0,1,2,3}
                        Verbosity level; 0=minimal output, 1=normal output, 2=verbose output, 3=very verbose output
  --settings SETTINGS   The Python path to a settings module, e.g. "myproject.settings.main". If this isn't provided, the DJANGO_SETTINGS_MODULE environment variable
                        will be used.
  --pythonpath PYTHONPATH
                        A directory to add to the Python path, e.g. "/home/djangoprojects/myproject".
  --traceback           Raise on CommandError exceptions
  --no-color            Don't colorize the command output.
  --force-color         Force colorization of the command output.