Improve mixlib-install to allow other products

Describe the Enhancement:

Actually I need two endpoints, one using Chef's mixlib-install and one overriding the mixlib-isntall with cinc project's one.

Improving mixlib-install to take an extra file to allow other products with their api url would avoid that.

Describe the Need:

I'd wish to have an internal omnitruck endpoint allowing me to install chef or cinc.

Current Alternative

Monkey patching mixlib-install options like this:

module Mixlib
  class Install
    class Options 
      SUPPORTED_PRODUCT_NAMES += %w(cinc auditor cinc-server)

      def initialize(options)
        @options = options
        @errors = []
        
        PRODUCT_MATRIX.product "auditor" do
          product_name "Cinc Auditor"
          package_name "auditor"
          downloads_product_page_url :not_available
        end

        PRODUCT_MATRIX.product "cinc" do
          product_name "Cinc client"
          package_name "cinc"
          downloads_product_page_url :not_available
        end

        PRODUCT_MATRIX.product "cinc" do
          product_name "Cinc client"
          package_name "cinc"
          downloads_product_page_url :not_available
        end
        ENV['PACKAGE_ROUTER_ENDPOINT'] =  ENV.fetch('PACKAGE_ROUTER_ENDPOINT', 'http://packages.cinc.sh') if %w(cinc auditor cinc-server).include? options[:product_name] 
        # Store original options in cases where we must remap
        @original_platform_version = options[:platform_version]

        resolve_platform_version_compatibility_mode!

        map_windows_versions!

        validate!
      
      end
    end
  end
end

Can We Help You Implement This?:

Merge request incoming :)

No file or test is named in the issue. Start by locating mixlib-install's product options, product matrix, and package-router endpoint configuration, then inspect existing tests for supported products and endpoint selection. Done means an additional configuration input can support Chef and Cinc products with separate API endpoints without monkey patches.