Add fake ruby-build wrapper for jdx/ruby

[dfrankland]

Summary

Trunk's ruby runtime installer works by downloading a copy of ruby-build and calling:

bin/ruby-build <version> <install-path>

This compiles Ruby from source, which is slow and requires a full build toolchain.

This PR adds .trunk/ruby-build.tar.gz — a tarball containing a fake bin/ruby-build script that intercepts that call and downloads a prebuilt, portable Ruby binary from mise (via the jdx/ruby releases) instead of compiling from source. This means Ruby installs in seconds rather than minutes, with no compiler required.

The script:

#!/bin/bash
set -euo pipefail
VERSION=$1
INSTALL_PATH=$2
OS=$(uname -s | tr '[:upper:]' '[:lower:]')
ARCH=$(uname -m)

mkdir -p "$INSTALL_PATH"

if [ "$OS" = "darwin" ]; then
  URL="https://github.com/jdx/ruby/releases/download/${VERSION}/ruby-${VERSION}.macos.tar.gz"
elif [ "$ARCH" = "x86_64" ]; then
  URL="https://github.com/jdx/ruby/releases/download/${VERSION}/ruby-${VERSION}.x86_64_linux.tar.gz"
else
  URL="https://github.com/jdx/ruby/releases/download/${VERSION}/ruby-${VERSION}.arm64_linux.tar.gz"
fi

curl -fsSL "$URL" | tar -xz --strip-components=1 -C "$INSTALL_PATH"

The tarball is referenced by the trunk.yaml changes in the follow-up PR #1113.

Test plan

• trunk tools install --verbose shows ruby 4.0.5 installed successfully
• ~/.cache/trunk/tools/ruby/4.0.5/bin/ruby exists after install

🤖 Generated with Claude Code

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Failed Test	Failure Summary	Logs
variant_quarantine_test should be quarantined when run with variant	A test expected the sum of 2 + 2 to be 5, but it was actually 4, indicating a failing assertion.	Logs ↗︎

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.37%. Comparing base (f584ee0) to head (9d48fd7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1112      +/-   ##
==========================================
+ Coverage   82.12%   82.37%   +0.24%     
==========================================
  Files          69       69              
  Lines       15243    15243              
==========================================
+ Hits        12519    12556      +37     
+ Misses       2724     2687      -37     

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