GitHub Actions triggers EAS builds when EXPO_TOKEN and non-interactive flags are set
Local builds must succeed before CI can be honest
GitHub Actions cannot invent EAS credentials, bundle identifiers, or build profiles for you. Expo's own CI guide starts with a blunt prerequisite: run a successful eas build from your machine for every platform you want CI to support, so the CLI can finish interactive setup once. That local run creates the EAS projectId, writes eas.json profiles, fills critical app config fields such as the Android package and iOS bundle identifier, and creates the Android keystore plus iOS distribution certs and provisioning profiles that later non-interactive jobs expect to find.
If you skip that step and paste a workflow into .github/workflows/eas-build.yml first, CI fails in ways that look like Actions problems.
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