Support prebuilt airplanes.live images in update and runtime scripts #13

Job	Run time
shellcheck + bash -n	17s
installer smoke (debian:13-slim, bundled)	45s
installer smoke (ubuntu:24.04, bundled)	47s
image rootfs smoke	19s
bats	35s
installer smoke (ubuntu:24.04, standalone)	58s
installer smoke (debian:13-slim, standalone)	51s
	4m 32s

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