docker/conf/swh-web: Ensure to use a new empty database in dev mode
When overriding swh-web sources, default development database will be used but it corresponds to the local swh-web development database on the host sytem using sqlite3 backend.
So ensure to use a newly created sqlite3 database located in the swh-web service container instead to not persist data across docker environment sessions.
Migrated from D5869 (view on Phabricator)