Allow pre-configuring channels without a running instance

[dhirschfeld]

I guess the channel information is kept in the database? This would therefore enable the CLI to directly manipulate the database without having to go through the REST api.

[dhirschfeld]

It would be ideal to be able to specify an initial set of channels in the config file

[dhirschfeld]

For now I've hacked it in my dockerfile:

RUN quetz create /home/user/quetz
WORKDIR /home/user/quetz

RUN python <<EOF
from quetz.database import get_session
from quetz.db_models import Channel

session = get_session("sqlite:///./quetz.sqlite")
for env in ('dev', 'uat', 'prod'):
    channel = Channel(
        name=f"seau/{env}",
        description=f"Conda channel for the {env.upper()} environment."
    )
    session.add(channel)

session.commit()
session.close()
EOF