chore: more graceful error on missing GITHUB_TOKEN in codegen #2719

Job	Run time
Prepare CI	3s
Lint App / biomejs	15s
Tests / Run Tests	2m 23s
Tests / SonarQube Cloud Analysis	59s
Build / Build Windows (electron-builder)	2m 5s
Build / Build macOS (electron-builder)	2m 57s
Build / Build Linux (electron-builder)	3m 51s
	12m 33s

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