test: container lab for the two-tier apply
A disposable ubuntu container, a fake private tier and a fake bootstrap endpoint, so the whole documented path — chezmoi init --apply, dotup pick, dotup private, cmp apply, dotsecrets — can run end to end without touching a real machine or a real credential. The fake tier mirrors the real one's structure (seven secrets and one alias) because dotsecrets is copied verbatim and the "8 exports, not 7" assertion depends on that cardinality; its ids are sequential and obviously synthetic. check-verbatim.sh keeps the fake tier's copies of shipped files honest, and snapshot.sh records file modes so a 644 where a 600 belongs is a diff.
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