I somehow missed running an actual integration test of the PEP 517 API
in CI and the python shim was using the old uv CLI interface still.
The tests include pip, uv and `python -m build`. They must be a in CI
job since we can't depend on the Python package in the Rust tests (we
only get the binary in `cargo test`, not the `uv_build` wheel).
uv itself is a large package with many dependencies and lots of
features. To build a package using the uv build backend, you shouldn't
have to download and install the entirety of uv. For platform where we
don't provide wheels, it should be possible and fast to compile the uv
build backend. To that end, we're introducing a python package that
contains a trimmed down version of uv that only contains the build
backend, with a minimal dependency tree in rust.
The `uv_build` package is publish from CI just like uv itself. It is
part of the workspace, but has much less dependencies for its own
binary. We're using cargo deny to enforce that the network stack is not
part of the dependencies. A new build profile ensure we're getting the
minimum possible binary size for a rust binary.
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Co-authored-by: Zanie Blue <contact@zanie.dev>
