A command sealup cannot run

  ✗ Unknown flag --dryrun.
    Run sealup --help for the commands and flags that work.

    More: sealup.dev/e/usage

Exit code: 2. Server changed: no.

What happened

The command line, or an input of the GitHub action, is not one sealup can run: an unknown command or flag, a flag without its value, -q with -v, too many target names, an unknown help topic, a server address sealup cannot use, or an action input outside what it takes.

Why

sealup stops on anything it does not understand rather than guess.

The fix

Read the first line of the error, then sealup --help, or sealup help <command> for one command. The command pages list every flag.