Passthrough stopped working in 7.x
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Issue body
```
Bad snapcraft.yaml content:
- extra field 'passthrough' not permitted in 'apps.server' configuration
```
Snapcraft.yaml:
https://github.com/ted-gould/lxd-terminal/blob/main/snap/snapcraft.yaml
Works great if I switch back to the 6.x series and build. Doesn't work on 7.0.x or 7.1.
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