If, on your #RPi you run #Ubuntu, & you want to run #Firefox from the Raspberry Pi OS in get media access, this seems to work for me.

Dockerfile

FROM arm64v8/debian:bookworm

ENV TZ="America/New_York"

RUN useradd user
RUN mkdir /home/user
RUN chown user:user /home/user

COPY raspi.list /etc/apt/sources.list.d/raspi.list
COPY raspberrypi-archive-stable.gpg /etc/apt/trusted.gpg.d/raspberrypi-archive-stable.gpg

RUN apt-get update
RUN apt-get upgrade --yes

RUN apt-get install --yes neofetch
RUN apt-get install --yes perl-modules pipewire pipewire-bin pipewire-alsa alsa-utils firefox
RUN apt-get install --yes rp-bookshelf evince xdg-utils

USER user
#CMD ["/usr/bin/firefox"]
CMD ["/bin/bash"]

# You might need to do:
#  xhost +local:docker
# To get X11 things to work.