Fix intermittent crashes during Swift package command execution

Swift package commands used by Tuist (such as swift package dump-package, swift package resolve, and xcodebuild -resolvePackageDependencies) now run with an explicit working directory. This prevents a rare Trace/BPT trap crash that could happen under heavy concurrent process setup when the process’s current working directory resolved to an empty string. Source: https://github.com/tuist/tuist/pull/10891