Can’t help with the Docker stuff.
HEVC encoding is performed using the GPU, not the CPU. It requires a GPU capable of encoding HEVC 10-bit video (the 2080 is good to go).
In addition to the HEVC Encoding (Experimental) Public Release announcement, details are available in the HEVC Encoding Forum Preview thread.
The Nvidia Encode/Decode Matrix lists the capabilities of their GPUs.
Information for Intel Quick Sync is available on Wikipedia: Intel Quick Sync Video - Wikipedia
