The script would include the quotes and so running `build/build` would
result in:
$ build/build
Running build..
✓ Radicle key already in ssh-agent
Building Radicle 1.2.0..
Creating archive of repository at e9cf91… in build/heartwood-e9cf91….tar.gz..
Building image (radicle-build-1.2.0)..
[1/2] STEP 1/17: FROM rust:"1.85"-alpine3.20 AS builder
Error: creating build container: parsing reference "rust:\"1.85\"-alpine3.20": invalid reference format
Co-authored-by: Lorenz Leutgeb <lorenz.leutgeb@radicle.xyz>
Instead of hardcoding the version of the Rust alpine file, introduce an `ARG` in
the `Dockerfile`. In `build/build`, we determine the version by inspecting
`rust-toolchain.toml`, and pass this value in. This ensures that the binaries
are built using the same toolchain that we develop with.