Support ROCm-docker build

[FruityWelsh]

I want to assume that this would work.
'''
docker build -t mycroft/mimic2:gpu -f radeon_gpu.Dockerfile .
docker run -it -p 3000:3000 mycroft/mimic2:gpu
'''
with main change being radeon_gpu having '''FROM rocm/tensorflow-1.8.0-python3''' instead of '''FROM tensorflow/tensorflow:1.8.0-gpu-py3'''.

I am currently unable to test do to limited access to my system, but I am defiantly interested in seeing if this works.

[el-tocino]

I would focus your efforts on something like Mozilla TTS. It's much more updated and long-term viable vs. this.