Multi arch image with nvidia decode support

* build working

* update makefile

* use jellyfin-ffmpeg for all arch

* just build web once for all arch

* update actions build

* update docs

docs/docs/contributing.md

@@ -102,6 +102,12 @@ This should show <50% CPU in top, and ~80% CPU without `-c:v h264_v4l2m2m`.
 ffmpeg -c:v h264_v4l2m2m -re -stream_loop -1 -i https://streams.videolan.org/ffmpeg/incoming/720p60.mp4 -f rawvideo -pix_fmt yuv420p pipe: > /dev/null
 ```
 
+**NVIDIA**
+
+```shell
+ffmpeg -c:v h264_cuvid -re -stream_loop -1 -i https://streams.videolan.org/ffmpeg/incoming/720p60.mp4 -f rawvideo -pix_fmt yuv420p pipe: > /dev/null
+```
+
 ## Web Interface
 
 ### Prerequisites