* Add support for ARM in Dockerfile
Create script dockerbuild.sh to check
if the CPU is amd64,arm or arm64 so GOARCH can be dynamicly defined
instead of hardcoding amd64
* Use case - esac
* Add ARG GOARCH
Add ARG GOARCH so when defined in `docker ----build-arg` it will compile
to this target platform, otherwise use the arch defined by the
build host.
* Use simpler docker build command
- Add GOOS=linux and GOARCH=amd64 in Dockerfile
- Remove dockerbuild.sh
* Use empty ARG values
