opcache/dev image considerations

[timkelty]

I'm not sure we'll end up with a dedicated dev image, but if we do we should consider keeping opcache enabled with opcache.validate_timestamps=1.

People seem to be using that to speed up the dev image and still see changes:

• Dev image performance is 10x slower than prod docker#72
• Disable opcache on dev images by default docker#8

[jasonmccallister]

I think we are going to move away from offering dev images, there is no reason the image cannot be extended to make a development version, but I think focusing on production for now makes the most sense. Also, opcache is not installed with the recent rebase in #5.

Probably best to document how to extend these images to include xdebug?

[timkelty]

Also, opcache is not installed

Will it be, or it just isn't currently?

[jasonmccallister]

@timkelty https://github.com/craftcms/image#customizable-settings