🚀 Optimize EAS build times with caching and reduced architectures

[williamchong]

Enable ccache for iOS, limit Android to arm64-v8a, and add EAS build cache keys to speed up warm builds.

[Copilot]

Pull request overview

This PR aims to speed up EAS warm builds by enabling additional caching and reducing build work (Android ABI narrowing, iOS compilation caching) in this Expo-managed app.

Changes:

• Added an explicit EAS build cache key to all build profiles (development/preview/production).
• Enabled iOS ccache via expo-build-properties.
• Limited Android build architectures to arm64-v8a via expo-build-properties.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
eas.json	Adds cache.key to each EAS build profile to influence warm-build caching behavior.
app.json	Updates expo-build-properties to enable iOS ccache and restrict Android ABIs to arm64.

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[Copilot]

Setting Android to build only arm64-v8a can break local development on the default Android emulator (commonly x86_64), and can also drop support for 32-bit/other ABIs if you intend to distribute broadly. If the intent is only to speed up EAS production builds, consider scoping the ABI restriction to the relevant EAS build profiles (or keeping x86_64 for debug/dev) rather than applying it globally in app.json.

Suggested change

	"buildArchs": ["arm64-v8a"]
	"buildArchs": ["arm64-v8a", "x86_64"]