Not able to run plugin without sudo (or rather install dependencies)

[aleksey-chugaev]

My work laptop is partially locked and I can't use sudo to install xcodeproj globally. I can however use bundler to install it locally into vendor/bundle. So a workaround for me is to include a Gemfile in my project:

gem 'xcodeproj', '1.7.0'

Install it with bundle install --path vendor/bundle.
And then modify plugin to change ruby build/projimport.rb for bundle exec ruby build/projimport.rb:

...
val scriptArgs = mutableListOf(
        "exec",
        "ruby",
        "build/projimport.rb",
        config.projectPath!!,
        config.target!!,
        config.group,
        File(project.projectDir, "src").path)

    val std = ByteArrayOutputStream()
    val err = ByteArrayOutputStream()
    val result = projectExec(project,
        "bundle",
        null,
        scriptArgs,
        std,
        err
    )
...

Would be good if the plugin could support this, either via a flag in plugin config or by scanning project files to check if a bundler is used.
I could raise a PR if you could advice a preferred way to implement this.