Would multi-stage Docker builds be nice?

[jessehl]

Hi!

While implementing DoubleDutch (and migrating my own stack to Docker 😄), I've stumbled upon multi-stage builds. This can actually be really useful in this case:

• The size of the image can be drastically reduced (as we really only need the base image of ubuntu and the compiled binary to run the server, right?)
• You may easily create a test stage (e.g. using a Python image), in which you simpy execute the server binary (created in a different stage), and run some Python test scripts against that server.

What do you think?

[FryingDutch]

Will look into it!