convenience images staging environment

CircleCI images for Clojure

CircleCI images for jruby

CircleCI images for buildpack-deps

CircleCI images for DynamoDB

CircleCI images for MariaDB

CircleCI images for Redis

CircleCI images for MongoDB

CircleCI images for MySQL

CircleCI images for Elixir

CircleCI images for OpenJDK

CircleCI images for Python

CircleCI images for Go

CircleCI images for PHP

CircleCI images for Ruby

CircleCI images for Rust

CircleCI images for Node

CircleCI images for Postgres

CircleCI images for Android