uv refuses to run when a project pins a required-version it does not
match, in either direction: RomM pins ==0.12.13, which fails against
both the 0.10.3 a container was built with and the 0.12.17 latest
installs.
UV_PROJECT_DIR points setup_uv at the project so it reads that pin. It
is a prefix like PYTHON_VERSION and UV_VERSION, and the call sits
directly under fetch_and_deploy: the project is on disk by then, and
the deploy has closed its message block, which setup_uv needs since it
opens one of its own. That is also the only call needed - nothing
between the old early call and the deploy uses uv or Python, so the two
collapse into one.
Two things found along the way:
UV_PYTHON was set as a command prefix on setup_uv in 14 places. setup_uv
reads PYTHON_VERSION, never UV_PYTHON, and a prefix assignment does not
outlive the call, so those pins did nothing. They now use
PYTHON_VERSION, which installs the interpreter they were asking for.
Five update scripts had no setup_uv at all while their install
counterpart pinned a Python version. They now carry the same pin.
immich is left out: it runs uv through sudo -u inside a retry loop.
Replaces the misc/build.func bootstrap with the two-root core loader.
No other change: the engine contract (var_*, update_script, start,
build_container, description) is identical on both engines.
CanbiZ (MickLesk)