Ruby file permissions

[jhoffner]

require 'yaml/store'
store = YAML::Store.new 'candy.yml'

is failing due to file access error.

[xcthulhu]

This appears to be due to the fact that in the Dockerfile, we have WORKDIR /codewars but codewarrior doesn't have permission to write there (it's owned by root).

I would suggest the following fix:

require 'yaml/store'
store = YAML::Store.new '/tmp/candy.yml'

[xcthulhu]

I'm going to close this, if that's alright.