SwiftPM6: Fix to skip locking package build directory

[fxwx23]

Starting with SwiftPM 6, a mechanism was introduced to lock the package build directory to prevent simultaneous builds/tests. Unfortunately, this behavior affects the swift package dump-package command used by this tool to retrieve dependency information. Specifically, when this tool is executed via a plugin in Swift 6, the workspace gets locked. This can lead to issues such as processes hanging and timing out when running on CI.

Steps to reproduce

$ swift --version
swift-driver version: 1.115 Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx14.0

$ swift package xcode-selective-test

Running process never terminates with Swift 6.

Changes in this PR

To preserve the previous behavior, a new --ignore-lock option has been introduced. This patch ensures that the option is automatically added when running on Swift 6 or later.

References

• Bring back "Lock scratch directory during tool execution" swiftlang/swift-package-manager#7291
• Skip locking package build directory apple/swift-mmio#84

[mikeger]

@fxwx23 included in the release https://github.com/mikeger/XcodeSelectiveTesting/releases/tag/0.10.5