All I get after picking the primary team:
panic: Failed to create index pq: could not create unique index "idx_users_email_unique"
goroutine 1 [running]:
panic(0xb8dd80, 0xc820252880)
/usr/local/go/src/runtime/panic.go:481 +0x3e6
github.com/mattermost/platform/store.SqlStore.createIndexIfNotExists(0xc8205870e0, 0xc8200211f8, 0x1, 0x1, 0x7f1ef69bd480, 0xc820021218, 0x0, 0x0, 0x0, 0x0, ...)
/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/store/sql_store.go:511 +0x6df
github.com/mattermost/platform/store.SqlStore.CreateUniqueIndexIfNotExists(0xc8205870e0, 0xc8200211f8, 0x1, 0x1, 0x7f1ef69bd480, 0xc820021218, 0x0, 0x0, 0x0, 0x0, ...)
/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/store/sql_store.go:475 +0xba
main.cmdUpdateDb30()
/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:516 +0x1fc7
main.main()
/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:102 +0x9c4