I have noticed that mauimauer’s docker image does not stay very current with recent versions of Plex, so I took a stab at my own image that can be found below.
This image adds AMDGPU/VAAPI support to the excellent Linuxserver/Plex docker image. Dependabot will keep it up to date with their base image, which is generally well updated.
hexeth/docker-plex-amd (github.com)

Disclaimer: I am by no means an expert at this stuff, so absolutely welcome suggestions and/or pull requests