Add Dockerfile and script to create an Ubuntu Qt6 based build image for docker.

tools/build/Docker/Dockerfile.UbuntuQt6

@@ -0,0 +1,17 @@
+FROM ubuntu:rolling
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV TZ=Etc/UTC
+ENV UTC=true
+ENV ARC=false
+
+COPY ubuntuQt6.sh /tmp
+
+RUN apt-get update && \
+    apt-get upgrade --yes && \
+    sh /tmp/ubuntuQt6.sh && \
+    mkdir -p /builds
+
+WORKDIR /builds
+
+VOLUME [ "/builds" ]

tools/build/Docker/ubuntuQt6.sh

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+#!/bin/sh
+
+apt-get install --no-install-recommends --yes build-essential cmake doxygen git \
+libtool lsb-release \
+python3 swig \
+libboost-dev libboost-date-time-dev libboost-filesystem-dev libboost-graph-dev libboost-iostreams-dev \
+libboost-program-options-dev libboost-python-dev libboost-regex-dev libboost-serialization-dev libboost-thread-dev \
+libcoin-dev \
+libeigen3-dev libgts-bin libgts-dev libkdtree++-dev libmedc-dev libopencv-dev libproj-dev libvtk9-dev \
+libx11-dev libxerces-c-dev libyaml-cpp-dev libzipios++-dev libpcl-dev python3-yaml \
+\
+pybind11-dev qt6-base-dev qt6-svg-dev qt6-tools-dev qt6-webengine-dev libpyside6-dev libshiboken6-dev pyside6-tools \
+pyqt6-dev-tools python3-dev python3-matplotlib python3-packaging python3-pivy python3-ply python3-pyside6.qtcore \
+python3-pyside6.qtgui python3-pyside6.qtnetwork python3-pyside6.qtsvg python3-pyside6.qtwebchannel \
+python3-pyside6.qtwebenginecore python3-pyside6.qtwebenginequick python3-pyside6.qtwebenginewidgets python3-pyside6.qtwidgets \
+\
+libocct-data-exchange-dev libocct-draw-dev libocct-foundation-dev libocct-modeling-algorithms-dev libocct-modeling-data-dev \
+libocct-ocaf-dev libocct-visualization-dev occt-draw \
+\
+libsimage-dev doxygen libcoin-doc libspnav-dev checkinstall