second commit

Dockerfile

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+# syntax=docker/dockerfile:1
+FROM ubuntu:jammy as base
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update
+
+# Build tools
+RUN apt-get install -y git build-essential libtool autotools-dev automake cmake nasm
+RUN apt-get install -y x11vnc libx11-dev libxext-dev xvfb
+RUN apt-get install -y libpam0g-dev
+RUN apt-get install -y python3
+
+FROM base as sources
+ADD https://github.com/libjpeg-turbo/libjpeg-turbo.git /tmp/turbojpeg
+ADD https://github.com/TurboVNC/turbovnc.git /tmp/turbovnc
+
+FROM sources as build
+WORKDIR "/tmp/turbojpeg/build"
+RUN cmake -G"Unix Makefiles" ..
+RUN make -j4 && make install
+
+WORKDIR "/tmp/turbovnc/build"
+RUN cmake -G"Unix Makefiles" -DTVNC_BUILDVIEWER:BOOL=false ..
+RUN make -j4 && make install
+
+RUN apt-get install -y icewm
+RUN apt-get install -y x11-apps
+
+# develop only
+RUN apt-get install -y net-tools socat
+
+EXPOSE 5900
+
+COPY app/*.sh /app/
+CMD ["/app/app.sh"]
+
+# https://dunedlin.wordpress.com/2020/10/24/a-minimal-x11-install/
+# https://askubuntu.com/questions/1313445/how-do-i-install-vnc-on-a-headless-ubuntu-20-10
+# https://github.com/mviereck/x11docker/wiki/How-to-access-X-over-TCP-IP-network

app/app.sh

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+#!/bin/bash
+
+bail()
+{
+  while true; do
+    sleep 1
+  done;
+}
+
+export DISPLAY=:$DISPLAY_NUM
+echo Hallo at $DISPLAY
+exec Xvfb $DISPLAY -screen 0 1024x768x24 &
+exec icewm-session &
+exec socat TCP-LISTEN:60$DISPLAY_NUM,fork,bind=0.0.0.0 UNIX-CONNECT:/tmp/.X11-unix/X$DISPLAY_NUM &
+exec x11vnc -display $DISPLAY -forever -noxdamage -shared

bash.sh

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+#/bin/bash
+
+docker run --rm --net bridge -p 5910:5900/tcp -e DISPLAY=:99 -it xserver-vnc bash --login

run.sh

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+#/bin/bash
+
+docker run --rm --net bridge -p 5910:5900/tcp -e DISPLAY_NUM=99 -it xserver-vnc