piaas app run with -t flag did not run sbt task in the background.

If we defined a sbt task, and start it with piaas app run -t. The sbt command will connect to incorrect tty and wait indefinitely. However, if we omit the -t flag, the sbt command can successfully run in the background.

Maybe we should fork a child to run the task ? We could terminate the forked child right after the task was executed, and tail from the main process.

Not sure whether sbt is the sole instance of such issue