Fix hardware acceleration with docker deployments

[dev-topsoil]

This PR potentially addresses #12

Hardware acceleration has been broken with docker deployments causing it to fall back to software rendering.

Whoops. My bad.

Some graphics drivers were missing in the container and with this PR they're not. Claude also did some other edits that I need to validate before I move this out of a draft and get it ready to merge.

Testing

To test the changes you'll need to re-build the container with the --no-cache flag:
docker compose build --no-cache && docker compose up -d

[seitzbg]

Mine was definitely hw transcoding w/o this but my setup is an nvidia p2000 -> Docker in LXC w/ nvidia-container-toolkit.

Sun May 31 17:45:23 2026
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 580.142                Driver Version: 580.142        CUDA Version: 13.0     |
+-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  Quadro P2000                   Off |   00000000:C4:00.0 Off |                  N/A |
| 53%   47C    P0             25W /   75W |     557MiB /   5120MiB |      0%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI              PID   Type   Process name                        GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|    0   N/A  N/A         1309646      C   ...exmediaserver/Plex Transcoder        461MiB |
|    0   N/A  N/A         1418445      C   ffmpeg                                   92MiB |
+-----------------------------------------------------------------------------------------+