add amd gpu driver

[mikey0000]

in theory support should just be the same as intel quick sync. I've yet to try it out but will do so soon.

[jlesage]

The INSTALL_PACKAGES variable can be used to try.

[mikey0000]

version: '3'
services:
  handbrake:
    environment:
      INSTALL_PACKAGES: linux-firmware-amdgpu
    image: jlesage/handbrake
    ports:
      - "5800:5800"
    volumes:
      - "/docker/appdata/handbrake:/config:rw"
      - "/home/user:/storage:ro"
      - "/home/user/HandBrake/watch:/watch:rw"
      - "/home/user/HandBrake/output:/output:rw"
      - "/opt/amdgpu...:/opt/amdgpu"
    devices:
      - /dev/dri:/dev/dri

along with the amdgpu-install instructions for the host

I see GPU use spike here and there with the encoding but I'm unsure if I should be witnessing higher spikes on my 7900XTX
seeing odd spikes to 33% - 40% or so but still mostly CPU using VCN preset or H256
Both running handbrake directly and via docker-compose result in the same behaviour.

EDIT: I compiled ffmpeg with VCN support to compare, it seems the VCE support in Handbrake isn't working in this image. At least compared to ffmpeg on its own.

I can get encoding to work on Handbrake using the flatpak version.