def check_config(opts)
      return if %w[bcrypt init].include?(opts[:command])
      unless File.exists?(opts[:config])
        puts "No config file found at #{opts[:config]}"
        exit(1)
      end
    end
def check_config(opts)
      return if %w[bcrypt init].include?(opts[:command])
      unless File.exists?(opts[:config])
        puts "No config file found at #{opts[:config]}"
        exit(1)
      end
    end
Many commands must be run in the context of a vines server directory
 created with `vines init`. If the command can't find the server's config
 file, print an error message and exit.

 Returns nothing.