message: Increase main loop buffer size
  When running a big number of containers and stress the runtime
  with consecutive starts and stops the internal channel buffer
  might get full with <number of containers> * 2 events.
diff: @@ -66,6 +66,9 @@ use state::MountedContainer;
  type ExitCode = i32;
  type Pid = u32;
  +/// Buffer size of the main loop channel
  +const MAIN_BUFFER: usize = 1000;
  +
  #[cfg(feature = "rt-island")]
  type RuntimeLauncher = island::Island;
  @@ -264,7 +267,7 @@ async fn runtime_task<L: Launcher>(
  stop: CancellationToken,
  ) -> Result<(), Error> {
  // Northstar runs in a event loop
  - let (event_tx, mut event_rx) = mpsc::channel::<Event>(100);
  + let (event_tx, mut event_rx) = mpsc::channel::<Event>(MAIN_BUFFER);
  let mut state = State::<L>::new(config, event_tx.clone()).await?;
  