Add workaround for package path support missing

Author: mokagio

.buildkite/commands/shared-set-up.sh

@@ -3,8 +3,12 @@
 echo "--- :rubygems: Setting up Gems"
 install_gems
 
+# The push/pop is workaround for tooling not supporting a Package.swift path.
+# Note that neither ours nor Apple's tooling does.
+pushd "$(dirname "${BASH_SOURCE[0]}")/../../Modules"
 echo "--- :swift: Setting up Swift Packages"
 install_swiftpm_dependencies
+popd
 
 echo "--- :xcode: Fetch XCFrameworks"
 rake dependencies