feat: refuse to run on a runtime-overlay-managed image (#112) #288

Job	Run time
unit tests	3m 26s
script install (ubuntu:24, bundle)	56s
image build mode	19s
script install (ubuntu:24, bootstrap)	52s
mounted image upgrade (new contract)	1m 14s
webconfig drift	1m 4s
mounted image upgrade (legacy contract)	1m 12s
unit tests (jq 1.6, fleet-compat)	4m 7s
script install (debian:13, bootstrap)	44s
script upgrade (stable main)	51s
script upgrade (pre-schema-split pin)	53s
script install (debian:13, bundle)	45s
lint	29s
	16m 52s

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