Base image on Alpine to optimize image size

[elias5000]

• Size is reduced to ~55MiB from ~680MiB before by using plain Alpine as base

[Silex]

Hum I think what you said in #20 is innacurate:

python               2.7-alpine          0781c116c406        9 days ago          72.4MB
python               2.7-alpine3.7       8a6404845d59        9 days ago          68.1MB

I think your idea to use alpine as the base is good, but I'm not sure using alpine:3.7 over python:2.7-alpine is the best solution...

Advantages for using python:2.7-alpine as the base image is that you control the version more explicitely. Advantage for using alpine:3.7 is you chop 20 MB more.

mjpeg-relay-alpine           latest      31a034709369        36 seconds ago      55.8MB
mjpeg-relay-python-alpine    latest      65012f5e061e        9 seconds ago       76.1MB

Any other pros/cons you see?

[elias5000]

My goal was to get the image as tiny as possible.
It's a matter of taste whether to take the alpine image from python (which installs python from source) or plain Alpine which installs python from the repository.

For me saving ~25% image size is making the difference.

[Silex]

Alright. Let's wait for @OliverF to merge.