Start a rednerd server alongside odoo

https://project.orus.io/project/migration-odoo-13/task/309

See also dev_doc: https://doc.xcg.io/dev_doc/en/default/redner.html

One important TODO:

    # TODO make this work without network_mode="host" (would need to use the
    # postgresql server started by this script).

changed the description

closed

Replaced by !16 (merged)