Add a pydantic validator for common-id

Metadata

Project: snapcraft
Number: #5624
Type: issue
State: open
Author: mr-cal
Labels: Status: Triaged Type: Enhancement
Created: 2025-07-17 19:44:53+00:00
Updated: 2025-07-17 20:14:11+00:00
Closed: —

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Issue body

### What needs to get done Add a validator for the `common-id` field based on https://www.freedesktop.org/software/appstream/docs/sect-Metadata-Application.html#tag-id-desktopapp. ### Why it needs to get done To speed up development by raising an error early, before launching a build environment.

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