"Just works" dockerized gcups

This is just gcups working in docker using xvfb-run and fixed dbus

Dockerfile

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+FROM docker.io/ubuntu:jammy-20240227
+RUN apt-get update && apt-get install -y wget gpg xvfb libgbm-dev libasound2 && \
+    # GC UPS App official setup
+    wget -qO- https://gcups-static.greencell.global/csgsa-keyring.gpg | gpg --dearmor | dd of=/usr/share/keyrings/csgsa-keyring.gpg && \
+    echo "deb [arch=amd64 signed-by=/usr/share/keyrings/csgsa-keyring.gpg] https://gcups-static.greencell.global/deb stable non-free" | dd of=/etc/apt/sources.list.d/gcups.list && \
+    apt-get update -y && apt-get install -y gcups && \
+    rm -rf var/lib/apt/lists/*
+
+EXPOSE 8080
+COPY init.sh /opt/init.sh
+ENTRYPOINT ["/opt/init.sh"]

init.sh

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+#!/bin/bash
+
+dbus-daemon --session --fork --print-address 1 > /tmp/dbus-session
+export DBUS_SESSION_BUS_ADDRESS=$(cat /tmp/dbus-session)
+service dbus start
+
+xvfb-run gcups -vvv --no-sandbox