Add Redis container

[fdespier]

Description

Add a Redis container to have a key-value store.

Checklist:

• [X] I have performed a self-review of my own code
• [X] My changes generate no new warnings and may be built with production flag without error
• [X] I removed all unused comments or code

[fdespier]

Need review @lbassin @Kubenic

[lbassin]

Hi @orions ! Thank you for your contribution :)

Unluckily we changed the configuration structure at the same time you created your PR
Can you please rebase on master ?

You will have some changes to do after that for your configuration :

• Create a folder containers/redis
• Move your redis.yml to containers/redis/form.yml
• Remove docker and version entry in your yml file and change image to logo
• Add a new file manifest.yml with this content :

  docker:
  image: 'redis'
  tag: 'latest'

[fdespier]

@lbassin fixed

[lbassin]

It's perfect, thank you! :)