Specify the Ruby version in Gemfile
Specify the Ruby version in Gemfile

We read the version from the CUSTOM_RUBY_VERSION environment variable
if it exists.  Otherwise, we use Heroku's default Ruby version.

codeunion/api.codeunion.io,codeunion/api.codeunion.io,chrisswk/api.codeunion.io,chrisswk/api.codeunion.io