swh-idx-storage: Unify production and development start up
Related T1533 Depends on swh-indexer!441 (closed)
Test Plan
doco up -d swh-idx-storage
doco logs --follow swh-idx-storage
Everything starts fine.
Start messing with the /indexer_storage.yml (rename it badly, remove keys, etc...) Restart the server, the server won't restart explaining why.
Migrated from D1171 (view on Phabricator)