Permission issue when Swift toolchain/docc is installed as root user

[xtremekforever]

Description

When the Swift toolchain is installed to / or /usr/libexec (as is done with Debian and Fedora distributions), the docc binary throws a permissions issue when attempting to preview or generate documentation:

xtremek@Winter ~/t/swift-async-algorithms (main) [1]> ls -la /usr/libexec/swift/6.0.3/bin/docc
-rwxr-xr-x 1 root root 23984936 Dec 15 19:00 /usr/libexec/swift/6.0.3/bin/docc*
xtremek@Winter ~/t/swift-async-algorithms (main)> /usr/libexec/swift/6.0.3/bin/docc preview
Input: ~/tmp/swift-async-algorithms
Template: /usr/libexec/swift/6.0.3/share/docc/render
Error: Error Domain=NSCocoaErrorDomain Code=513 "You don’t have permission."

However, if the Swift toolchain and docc are installed to a directory under the user, like in the user's home directory or via Swiftly, then it works perfectly fine:

xtremek@Winter ~/t/swift-async-algorithms (main)> ls -la $(which docc)
lrwxrwxrwx 1 xtremek xtremek 32 Jan  4 15:36 ~/.local/bin/docc -> ~/.local/bin/swiftly*
xtremek@Winter ~/t/swift-async-algorithms (main)> ~/.local/bin/docc preview
Input: ~/tmp/swift-async-algorithms
Template: ~/.local/share/swiftly/toolchains/6.0.3/usr/share/docc/render
========================================
Starting Local Preview Server
         Address: http://localhost:8080/documentation/validation
========================================

Any ideas why this happens? It makes it impossible to have Swift installed to the system and then use docc to preview and generate documentation, for example in a CI environment...

Checklist

• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue.

Expected Behavior

Running docc convert or docc preview when the Swift toolchain is installed to a system directory with root permissions works.

Actual behavior

Running docc convert or docc preview when the Swift toolchain is installed to a system directory with root permissions throws a permissions error:

Error: Error Domain=NSCocoaErrorDomain Code=513 "You don’t have permission."

Steps To Reproduce

1. Install Swift to a system directory such as / or /usr/libexec/swift.
2. Run docc preview from the system directory.
3. Observe that it does not work, but throws a permissions issue.

Swift-DocC Version Information

Swift 6.0.3 Release

Swift Compiler Version Information

Swift version 6.0.3 (swift-6.0.3-RELEASE)
Target: aarch64-unknown-linux-gnu

[RandomHashTags]

Can confirm using Swiftly + manually selecting the toolchain in VS Code and updating the PATH as a workaround (at least for Arch Linux).