Dynamically create Rake tasks for all Dockerfiles (following the convention "<name>.Dockerfile") in the current directory

Rakefile

require 'rake/file_list'

IMAGES = Rake::FileList['*.Dockerfile'].collect {|f| f[/.+(?=\.Dockerfile)/] }

namespace :images do
  IMAGES.each do |name|
    desc "Build image '#{name}'"
    task "build_#{name}" do
      sh "docker build -f #{name}.Dockerfile -t mtrense/#{name} ."
    end
  end
  desc 'Build all images'
  task build_all: IMAGES.collect {|i| "build_#{i}" }
end

desc 'Build all images'
task default: 'images:build_all'