Add Docker configuration

[rodfersou]

No description provided.

[petschki]

sry ... I'm not the right reviewer for this changes

[rodfersou]

@petschki thanks

if you want to try, just install docker and docker compose:
https://docs.docker.com/get-docker/
https://docs.docker.com/compose/install/ (depending on your platform, the previous step also install this)

and run the commands:

make docker-build
make docker-start

In a new clone of this addon.

The idea here is to have same environment for development, CI, tests, staging and production, making it easier to get the Plone running.

Plone Docker image comes with almost everything needed to run Plone, run dependencies and cache.

Regards

[rodfersou]

After merge this branch will try to prepare a new branch to test Travis with Docker

[coveralls]

Coverage decreased (-0.001%) to 44.76% when pulling 2cfbb1a on docker into d0c72e3 on master.

[avoinea]

LGTM

[MrTango]

@rodfersou could you please have a look on my last commit to resolve the conflicts in the Makefile. If thats all fine, let's merge this.

[MrTango]

Not sure if we still need: VIRTUALENV_NOT_INSTALLED, i changed the way the venv is created to the Python3 way and also create in venv not in ".".

[MrTango]

there seem to be version issues with plone.recipe.codeanalysis, i'm not a big fan of this package amnyway, usually i use a tox setup with some flake8 directly. But we don't have this setup here right now.