def find_manifest
      ARGV.each do |arg|
        if arg =~ /\.json$|\.rb$|\.yml$/
          return arg unless ARGV[ARGV.find_index(arg) - 1].eql?("--cluster-file")
        end
      end
    end
def find_manifest
      ARGV.each do |arg|
        if arg =~ /\.json$|\.rb$|\.yml$/
          return arg unless ARGV[ARGV.find_index(arg) - 1].eql?("--cluster-file")
        end
      end
    end
find the .rb/.json/.yml file from the ARGV that isn't the clusterfile