feat: add ubuntu-vnc

Dockerfile

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+ARG VERSION
+
+FROM ubuntu:${VERSION:-latest}
+LABEL MAINTAINER="DCsunset"
+
+RUN apt-get update && \
+	DEBIAN_FRONTEND=noninteractive apt-get install -yq xfce4 xfce4-goodies \
+	tigervnc-standalone-server \
+	chromium-browser vim
+
+COPY ./config/helpers.rc /root/.config/xfce4/
+COPY ./config/chromium-WebBrowser.desktop /root/.local/share/xfce4/helpers/
+COPY ./start.sh /
+
+EXPOSE 5900 80
+
+CMD [ "/start.sh" ]

README.md

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+# docker-ubuntu-vnc
+
+An Ubuntu docker image to provide VNC access to
+Xfce desktop environment.
+
+## Usage
+
+```
+docker run -d -p 5900:5900 -e VNC_PASSWD=password dcsunset/ubuntu-vnc
+```
+
+If `VNC_PASSWD` is not set,
+then the security type of vncserver is set to None,
+it is **insecure** when exposing the container on the Internet.
+
+## Exposed ports
+
+* 5900: Used for VNC interface
+
+## Installed applications
+
+To make the image lightweight,
+only the following applications are installed by default:
+
+* Xfce desktop
+* TigerVNC server
+* Vim
+* Chromium browser
+
+## Fonts
+
+If non-latin characters are not displayed well,
+install the font packs based on your needs.
+
+To install the Indian font pack:
+
+```
+sudo apt-get install fonts-indic
+```
+
+To install the CJK font pack:
+
+```
+sudo apt-get install fonts-noto-cjk
+```
+
+To install the international font pack:
+
+```
+sudo apt-get install fonts-noto
+```
+
+## Build
+
+To use the latest Ubuntu image:
+
+```
+docker build -t ubuntu-vnc .
+```
+
+Or specify a version:
+
+```
+docker build --build-arg VERSION=18.04 -t ubuntu-vnc .
+```

config/chromium-WebBrowser.desktop

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+[Desktop Entry]
+NoDisplay=true
+Version=1.0
+Encoding=UTF-8
+Type=X-XFCE-Helper
+X-XFCE-Category=WebBrowser
+X-XFCE-CommandsWithParameter=chromium-browser --no-sandbox "%s"
+Icon=chromium-browser
+Name=chromium-browser
+X-XFCE-Commands=chromium-browser --no-sandbox

config/helpers.rc

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+TerminalEmulator=xfce4-terminal
+WebBrowser=chromium-WebBrowser

start.sh

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+#!/bin/bash
+
+umask 0077                # use safe default permissions
+mkdir -p "$HOME/.vnc"     # create config directory
+chmod go-rwx "$HOME/.vnc" # enforce safe permissions
+
+if [ ! -z $VNC_PASSWD ]; then
+	vncpasswd -f <<< "$VNC_PASSWD" > "$HOME/.vnc/passwd"
+	vncserver -fg -localhost no :0
+else
+	vncpasswd -f <<< "" > "$HOME/.vnc/passwd"
+	vncserver -fg --I-KNOW-THIS-IS-INSECURE -SecurityTypes None -localhost no :0
+fi
+