fix(docker): use rustup's -y flag so the builder stage is non-interactive

rustup-init.sh skips long options when deciding whether it needs a tty,
so --yes left need_tty=yes and the install aborted with 'Unable to run
interactively' inside docker build. Only the short -y sets need_tty=no.
ee25ca3f39flamboh committed on 8/24/2026, 3:59:15 AMparent4285b39
1 file changedLine totals unavailable