Build not (re)producible, too many implicit dependencies on environment

[FredrikWendt]

The current packaging of docker images depends on the client and server running the same version. This is not explicit anywhere.

09:38:34.422 time="2015-06-07T09:38:34Z" level=fatal msg="Error response from daemon: client and server don't have same version (client : 1.18, server: 1.17)" 

Possible solutions:

• don't run the go-agent in docker, but some other "container" (virtualbox?)
• make the build install the docker version that the server is running
• accept that the world is moving faster than we may want it to, and simply add a "fail fast" step early on in the build pipeline (https://github.com/FredrikWendt/DockerVersionTest)

[sennerholm]

My vote on the last one. Shall we add another "Pipeline" to ensure that the docker version is compatible?