project.new_target does only adds "Release" and "Debug" configurations

[neonichu]

project.new_target only adds "Release" and "Debug" build configurations, instead of one corresponding to each build configuration of the project. This leads to inconsistencies with Xcode:

#!/usr/bin/env ruby

require 'xcodeproj'

project = Xcodeproj::Project.new('foo.xcodeproj')
project.add_build_configuration('App Store', :release)
target = project.new_target(:static_library, 'Pods', :ios)
project.save

puts target.build_configurations.inspect
# => ['Release', 'Debug']

project2 = Xcodeproj::Project.open('foo.xcodeproj')
puts project2.targets.first.build_configurations.inspect
# => ['Release', 'Debug', 'App Store']