Error: smoke checks for ... failed: the app appears to be crashing

This article helped me get back to the beginning.

❯❯❯flyctl version upgrade
❯❯❯flyctl agent restart
❯❯❯fly deploy
...
  Tasks: TOP => db:prepare
  (See full trace by running task with --trace)
   INFO Main child exited normally with code: 1
   INFO Starting clean up.
   WARN hallpass exited, pid: 514, status: signal: 15 (SIGTERM)
  2023/06/19 07:27:16 listening on [fdaa:2:1661:a7b:ff:9bf6:5e8d:2]:22 (DNS: [fdaa::3]:53)
Error: smoke checks for 91857272a44328 failed: the app appears to be crashing```