phase2: fix signing steps when only apk_key is defined #69
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Signing steps are currently skipped if only APK signing is configured, because phase2 effectively enables signing only when
usignis present.Fix this by making
IsSignEnabledexplicitly cover APK signing too.While at it, refactor the signing checks into dedicated helper functions
IsUsignEnabled,IsApkSigningEnabled, andIsGpgSigningEnabled, and use them consistently to align phase2 with the phase1 implementation.