Add Drupal example

[geerlingguy]

trafficstars

Something more real-worldish, and more Dockerish, than examples I've seen so far (e.g. no mega-container with Apache+PHP+Composer+everything-under-the-sun inside).

If you're going to use Docker, don't jam in all the bad things about legacy deployment into one massive 1.2+ GB container!

Also, if there's any easy way to work on simple configurability (á la Drupal VM to make something like a 'Drupal VM lite', I'd like to explore it. So far most of the good Docker Drupal examples I've seen are a pain to customize/adapt, while most of the flexible Docker Drupal examples I've seen are slow, bloated, messy, and offer very little benefit over using plain old VMs.

[geerlingguy]

See also (just for an overview):

• https://github.com/socketwench/dropwhale (see the docker-compose.yml)
• http://docker4drupal.org/ (see the docker-compose.yml)
• http://www.kalabox.io/ (much more of a black box)
• http://docksal.io (a wrapper tool)

(etc.)