query to code sign PR builds on mac

[KristofferC]

Fixes #1127
Fixes #1000

Usage example:

~/juliaup main*
❯ ./target/debug/juliaup add pr59847   
Installing Julia pr59847-macos-aarch64

WARNING: PR builds are not code-signed for macOS.
The Julia binary will fail to run unless you codesign it locally.

Would you like to automatically codesign this PR build now? [y/N]: y

Codesigning Julia binary...
/Users/kc/.julia/juliaup/julia-pr59847/bin/julia: replacing existing signature
Codesigning Julia library...
/Users/kc/.julia/juliaup/julia-pr59847/lib/libjulia.1.13.0.dylib: replacing existing signature
/Users/kc/.julia/juliaup/julia-pr59847/lib/libjulia.dylib: replacing existing signature
/Users/kc/.julia/juliaup/julia-pr59847/lib/libjulia.1.13.dylib: replacing existing signature
✓ Codesigning completed successfully.

~/juliaup main* 20s
❯ ./target/debug/julia +pr59847        
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.13.0-DEV.1316 (2025-10-16)
 _/ |\__'_|_|_|\__'_|  |  kc/bracket_complete/6f38ab386b4 (fork: 1 commits, 2 days)
|__/                   |

julia> VERSION
v"1.13.0-DEV.1316"

Mostly built with Claude Code 🤖

[Copilot]

Pull Request Overview

This PR adds functionality to automatically handle code signing for Julia PR builds on macOS, addressing the issue where PR builds fail to run due to lack of code signing. The feature provides users with a prompt to automatically codesign Julia binaries and libraries after installation.

• Adds interactive codesigning prompt for PR builds on macOS
• Implements automatic codesigning of Julia binary and dylib files
• Provides fallback instructions for manual codesigning if user declines

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[IanButterworth]

Nice. Did you not need to sign the stdlibs?

[KristofferC]

Nope, Claude said that those had no signature at all while the julia itself and libjulia had a signature that was invalid which caused the crash..

[IanButterworth]

Ah ok

[KristofferC]

I guess for unsigned it does the web lookup but for invalid signed it just gives up straight away.. 🤷

[IanButterworth]

I think adding a test for this would be quite difficult, so confirming it works locally at least.

% ./target/release/juliaup add pr59893

WARNING: Note that unmerged PRs may not have been reviewed for security issues etc.
Review code at https://github.com/JuliaLang/julia/pull/59893

Installing Julia pr59893-macos-aarch64

WARNING: PR builds are not code-signed for macOS.
The Julia binary will fail to run unless you codesign it locally.

Would you like to automatically codesign this PR build now? [Y/n]: 

Codesigning Julia binary...
/Users/ian/.julia/juliaup/julia-pr59893/bin/julia: replacing existing signature
Codesigning Julia library...
/Users/ian/.julia/juliaup/julia-pr59893/lib/libjulia.1.13.0.dylib: replacing existing signature
/Users/ian/.julia/juliaup/julia-pr59893/lib/libjulia.dylib: replacing existing signature
/Users/ian/.julia/juliaup/julia-pr59893/lib/libjulia.1.13.dylib: replacing existing signature
✓ Codesigning completed successfully.
ian@Ians-MacBook-Pro juliaup % ./target/release/julia +pr59893  
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.13.0-DEV.1334 (2025-10-18)
 _/ |\__'_|_|_|\__'_|  |  DilumAluthgeBot:BumpStdlibs/JuliaSyntaxHighlighting-2817dba-master/4997e0a0dc5 (fork: 1 commits, 1 day)
|__/                   |

julia>