refactor: Add error handling for missing ANDROID_NDK_HOME in build_android_auto function

[itsalfredakku]

This pull request adds a check to ensure the ANDROID_NDK_HOME environment variable is set before proceeding with the Android build process. If the variable is not set, the script logs an error and exits early. This helps prevent build failures due to missing dependencies.

• Build environment validation:
  • scripts/build-android.sh: Added a check to verify that ANDROID_NDK_HOME is set, logging an error and exiting if it is not.

[Copilot]

Pull request overview

This pull request adds validation to check that the ANDROID_NDK_HOME environment variable is set before proceeding with the Android build process in the build_android_auto function. This helps prevent build failures by detecting missing configuration early.

Changes:

• Added environment variable validation in build_android_auto function to verify ANDROID_NDK_HOME is set before detecting device architecture and building

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[Copilot]

The error message for missing ANDROID_NDK_HOME is inconsistent with other similar checks in the script. The build_android() function (lines 91-96) provides helpful context including example paths for setting the variable. This check should include the same helpful information to maintain consistency and provide a better user experience.