Build MK for Linux

Scripts for building MK for Linux. The end result is a Docker container where you have all the static libs you need. We use Alpine, which is probably the best solution to produce statically linked Go binaries as needed by OONI for Linux.

Updating dependencies

Update:

1. the base image in Dockefile

2. measurement-kit/download.sh

3. measurement-kit/build.sh

Download dependencies

./measurement-kit/download.sh

Prepare docker image

docker build -t openobservatory/mk-alpine .
docker tag openobservatory/mk-alpine openobservatory/mk-alpine:`date +%Y%m%d`

Push docker image

docker push openobservatory/mk-alpine