The e2e script hardcoded the live Gitea hostname as the public tier's clone
URL. This repo is world-readable, so that published the host, and the same
host serves the secret-protected bootstrap route.
It now comes in as E2E_PUBLIC_URL, prompted for by the wrapper alongside the
bootstrap URL and passed to the container the same way. The lab already did
this with PUB_URL; this is the live path catching up. The :? form means an
unset variable aborts at that line with a message, rather than surfacing
later as an unattributable clone failure.
bcherb2
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