gen-workflows.rb

#!/usr/bin/env ruby
require 'fileutils'
require 'json'

Dir.chdir(__dir__)

jsonnet = system('jrsonnet', '--help', out: File::NULL, err: [:child, :out]) ? 'jrsonnet' : 'jsonnet'

Dir["./.github/workflows/*.jsonnet"].each do |src|
  dst = src.sub(/\.jsonnet$/, '.yml')
  p [src => dst]
  FileUtils.mkdir_p File.dirname(dst)

  File.open(dst, 'w') do |io|
    system(jsonnet, src, out: io, exception: true)
  end
end