cirrusci/android-sdk repository overview

Tags system is pretty simple:

• cirrusci/android-sdk:tools is a base image with just JDK 8 and the latest Android Command Line Tools⁠.
• cirrusci/android-sdk:N is an image based of cirrusci/android-sdk:tools that has everything pre-installed for Android API version N.

Sources: https://github.com/cirruslabs/docker-images-android⁠