Rocket.Chat and Stoat are both MongoDB-backed, and the backup engine only
understood postgres, mysql/mariadb and sqlite — so a live snapshot of either
would have captured a torn data directory that may not even mount.
Adds mongo as a fourth kind: mongodump --archive on the backup side,
mongorestore --archive --drop on the restore side (idempotent, so the caller's
retry loop works the same as it does for pg_dump --clean), and a ping-based
readiness probe that also waits out a replica set electing its primary.
Credentials are optional. The shared sh preamble sets them from
MONGO_INITDB_ROOT_USERNAME/PASSWORD when present and passes nothing when not,
built with 'set --' so a password containing spaces survives word splitting.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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