Using Docker on Android
Android apps already run as containers on top of linux, similar to docker, using cgroups/namespaces. To run docker on android, it needs to support docker's highlevel API. There is some discussion on the web, but most of it indicates the aufs file system as a blocker that needs an alternative.
Docker supports alternative file systems but using an alternative platform necessitates different images than the normal 64-bit user base, similar to when using Docker on 32-bit. Here is a good introduction to running Docker on ARM devices that covers a lot of what is involved. It was written before the alternative file systems were introduced but does talk about them near the end.