Docker must be installed.
Run
docker build -t marytts/marytts-dsb-hsb . \
--platform linux/amd64,linux/arm64
Omit the --platform
if your Docker Engine does not support multi-architecture building.
Run
docker run -it --rm -p 59125:59125 marytts/marytts-hsb-dsb
Then access MaryTTS via browser on the host at http://localhost:59125.