Android's default linting already contains a "missing translation" lint rule which you can activate: "MissingTranslation"[0]
For Android specifically: Gradle and Android Studio both support a powerful linting framework (to the level that it can provide auto-fixes to the IDE). It's better to provide an in-editor to guide your contributors before it hits CI, then have CI nag if they didn't fix the in-editor warnings/errors:
Some examples of custom lint rules[1] and the default rules which Android Studio runs[2]: