Modeled on LC Wallet's bitrise.yml. Push-only trigger map (develop->beta,
main->release), no PR-triggered checks. Reuses the existing Skip fastlane
lanes directly instead of a generic xcode-archive step, since build_app
already carries the Skip-specific xcconfig and build flags. Adds a beta
lane (TestFlight) to match release, which was the only lane wired before.
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