Easy development docker setup

[kelunik]

We need an easy way to develop Airship inside Docker. Currently I need three steps per change:

• docker-compose rm -vf
• docker-compose build airship
• docker-compose up

I already have docker-compose aliased to dc, but it's not the commands that's annoying, but a build time. The time is low if composer dependencies are already installed on the host, but it's still quite long.

This is especially important if you're developing Motifs, because you often check whether things are right. Also the above process involves setting it up every time.

We should probably have Docker volumes for all persistent files and not delete the containers + their volumes. If these are persistent, we also don't have to delete the database volume.

[bartekgn]

Im not using docker-compose, but this should work:
docker cp airship:/var/www /home/xxx/airship-www (copy airship from existing container)

In docker-composer add to airship section:

volumes:
     - /home/xxx/airship-www:/var/www

And after

docker-compose rm -vf
docker-compose build airship
docker-compose up

you should be able to edit files directly without rebuilding environment