Upgrade to PHP 5.6 with Zend OpCache and APCu

[renatomassaro]

• Upgrade to PHP 5.6
• Add "new" Zend OpCache
• Add "new" APCu cache (faster than APC)
• Install ImageMagick bin (used by Phabricator for meme creation)

Rebuilt from scratch and all is working well

[hach-que]

As per the comment in #13, this image needs to be migrated towards a derive and bake model before I can merge in more major changes.

[lamjack]

can i search this image in docker repository?

[hach-que]

We can't remove this as it's required for SSL to work.

[hach-que]

There are some issues with this change, and it needs to be rebased on the latest version in order to be merged.

[renatomassaro]

Yep, this PR changes were supposed to go only until commit f02e2d1. Not sure how I change the PR HEAD here on Github.

Since you said this image must be rewritten, I decided to reshape my fork to my own needs.

[hach-que]

Just an FYI, I'm working on bringing these changes upstream, along with a number of configuration improvements. In particular:

• The base image is upgraded to OpenSUSE Leap 42.1
• It'll have PHP 5.6 and APCu installed
• The number of layers in the Docker image are being significantly reduced
• You'll be able to configure it the conventional way with /config
• You'll be able to configure it by setting environment variables
• You'll be able to configure it by deriving your own image from this image, and running setup commands to bake the configuration in

I'll be updating the README with the new configuration options when this work is done.

[hach-que]

@renatomassaro All of these changes are now available in this image, and it now supports configuration via environment variables as well as scripts.

Going to close this PR as there's nothing left to do here.