dev env: Simplify the db initialization step

Right now for the storage, we need to run an extra step:

docker-compose run swh-storage init

This will soon become unmanageable when we start adding new swh services which requires the db initialization (scheduler, indexer storage)...

Those steps must be transparent when we start the container.

Migrated from T1444 (view on Phabricator)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information