Old rubies

ruby:version: with *-devel packages
ruby:version-slim: without *-devel packages

Tags

1.8.7-p374: ruby:1.8.7 ruby:1.8.7-slim
1.9.3-p551: ruby:1.9.3 ruby:1.9.3-slim
2.0.0-p648: ruby:2.0.0 ruby:2.0.0-slim
2.1.10: ruby:2.1.10 ruby:2.1.10-slim
2.2.10: ruby:2.2.10 ruby:2.2.10-slim
2.3.8: ruby:2.3.8 ruby:2.3.8-slim

Build

$ docker container prune # WARNING! removes all stopped containers!
$ docker image prune -A # WARNING! removes all images!
$ make
$ make push