Dockerfile

FROM zauberzeug/nicegui:2.13.0

COPY main.py .

main.py

import os

from nicegui import ui

if __name__ in {"__main__", "__mp_main__"}:
    #   os.environ["UVICORN_WORKERS"] = "1"
    #   os.environ["OMP_NUM_THREADS"] = "1"
    ui.label('test')
    ui.run(
        reload=False,
        native=False,
        uvicorn_logging_level='warning',
        show=False,  # prevents chromium injection
        port=8080
    )

start.sh

docker build -t issue_4521 .
docker run --rm -it -p 8080:8080 --memory=512m --cpus=1 issue_4521