(proof of concept) install.go: replace lua with ruby

[SeekingMeaning]

• This replaces yuin/gopher-lua and yuin/gluamapper with mitchellh/go-mruby
• Depends on Allow struct fields to be optional mitchellh/go-mruby#79
  • This PR uses my fork SeekingMeaning/go-mruby
• Vendoring of go-mruby based on https://github.com/mikesimons/yaml-dsl
• Haven't tested this with a fresh git clone

Example food aks-engine.rb using ruby DSL:
https://gist.github.com/SeekingMeaning/8b81f7a1fbbacfab68889f95ab1bd5f0

food do
  name 'aks-engine'
  description 'Azure Kubernetes Engine - a place for the community to collaborate and build the best Kubernetes infrastructure for Azure'
  license 'MIT'
  homepage 'https://github.com/Azure/aks-engine'
  version '0.53.0'

  package do
    os 'darwin'
    arch 'amd64'
    url "https://github.com/Azure/#{name}/releases/download/v#{version}/#{name}-v#{version}-#{os}-#{arch}.tar.gz"
    sha256 '9753ae612760d1572fb77e12c5c365202aa18d98a1c8c6dd433b911f4a3fa320'
    resource do
      path "#{name}-v#{version}-#{os}-#{arch}/#{name}"
      installpath "bin/#{name}"
      executable true
    end
  end

  ...

Example ruby food gofish.rb:
https://gist.github.com/SeekingMeaning/816462e3f66c961303208a2ac0c9e7b5

Example food using mitchellh/go-mruby#78 syntax:
https://gist.github.com/SeekingMeaning/8c701210400bd27edfaa06603a97ba9b

Note: This pull request is mostly just a proof of concept

[bacongobbler]

Why are you doing this?

[SeekingMeaning]

For fun 😛

[SeekingMeaning]

Closing this as it isn't a serious proposal, but I'm always open to discussion; feel free to comment here if you ever come back to this