Cross compilation docker image for Wails.
It is a multi-stage Dockerfile intended to build a Docker image capable of compiling for the following platforms:
Linux
- arm5: linux/arm, linux/arm-5 (broken)
 - arm6: linux/arm-6 (broken)
 - arm7: linux/arm-7
 
Mac OS X (Darwin)
- 386: darwin/386 (please don't use)
 - amd64: darwin/amd64
 
Windows
- 386: windows/i386
 - amd64: windows/amd64
 
docker build -t xgo:wails .
Accepts the same arguments as the original xgo:
xgo -v -image xgo:wails -targets=linux/arm-7 ./