This image contains some gems:
With this you are capable of execute scripts like this:
$ cat test.rb
puts "Hello Docker Container!"
$ docker run --rm -v $PWD:/data robertogyn19/ruby-script-tools ruby /data/test.rb
Hello Docker Container!
Or something more interesting:
$ cat test.rb
require("rye")
puts Rye.shell(:echo, "Hello Docker Container!").stdout
$ docker run --rm -v $PWD:/data robertogyn19/ruby-script-tools ruby /data/test.rb
Hello Docker Container!