No helpfull message when command doesn't exist

[Guillaume Beuzeboc]

If the command specified in the YAML doesn't actually exist, snapcraft provides the following non-helpful message:

Command '['snap', 'pack', '--filename', 'liquidctl_test_amd64.snap', '--compression', 'xz', PosixPath('/root/prime'), PosixPath('/root/project')]' returned non-zero exit status 1.
Failed to execute pack in instance.

I used the following example
snapcraft.yaml:
name: liquidctl
summary: empty
description: |
     empty
version: test
base: core22
confinement: strict

parts:
  liquidctl:
    plugin: python
    source: .
    stage-packages:
       - python3-usb

apps:
  liquidctl:
    command: wrongname # Here is the line that makes it fails.
    plugs:
      - raw-usb
      - hardware-observe

If the file could be checked, that would help to provide a helpful message for developers.

snapcraft --version
snapcraft 8.0.1