Multi-architecture docker images for go-ethereum

Currently supported:

• x64
• armv7
• arm64v8

Build Status: https://travis-ci.com/killinterpol/geth-multiarch

Docker Repo: https://hub.docker.com/r/killinterpol/geth-multiarch

Used by the RPi incognito node https://github.com/killinterpol/rpi-incognito

Thanks to OP for the build script & dockerfile :)