[Feature] Combined Docker image

[tchapi]

• combined Docker image with Caddy, supervisord, PHP-fpm
• new workflow to build both flavours of the image (davis, davis-standalone)

[Ramblurr]

FWIW I have an all-in-one davis image (nginx, phpfpm, davis) over here. Though I'll be retiring it soon as I move from a container deployment to NixOS. Feel free to yoink anything if you want.

[tchapi]

Thanks for the pointers. Do you have a TL,DR of the improvements you made (apart from adding the reverse-proxy in there), that would be helpful to bake into a common standalone image?

[Ramblurr]

Things I added that I think are worthwhile are:

• the opcache settings for a perf boost
  • opcache.ini
  • installed in Dockerfile
  • default env vars
• php fpm tuning settings
  • www.conf
  • in particular the pm.max_children I had to raise from whatever the default was because when I migrated to davis and did a full sync from my old provider it ran out of children and stalled the sync process.