CI: Extract apt packages installation into a script.

This provides a few benefits, as regular users can just call this script
as well and not need to copy this from the CI files to know which files
to install.

package/ubuntu/install-apt-packages.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+set -euo pipefail
+
+# Update package lists quietly
+sudo apt-get update -qq
+
+packages=(
+  ccache
+  doxygen
+  graphviz
+  imagemagick
+  libboost-date-time-dev
+  libboost-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
+  libkdtree++-dev
+  libmedc-dev
+  libocct-data-exchange-dev
+  libocct-ocaf-dev
+  libocct-visualization-dev
+  libopencv-dev
+  libproj-dev
+  libpyside2-dev
+  libqt5opengl5-dev
+  libqt5svg5-dev
+  libqt5x11extras5-dev
+  libshiboken2-dev
+  libspnav-dev
+  libvtk7-dev
+  libx11-dev
+  libxerces-c-dev
+  libyaml-cpp-dev
+  libzipios++-dev
+  netgen
+  netgen-headers
+  ninja-build
+  occt-draw
+  pyqt5-dev-tools
+  pyside2-tools
+  python3-dev
+  python3-git
+  python3-markdown
+  python3-matplotlib
+  python3-packaging
+  python3-pivy
+  python3-ply
+  python3-pyside2.qtcore
+  python3-pyside2.qtgui
+  python3-pyside2.qtnetwork
+  python3-pyside2.qtsvg
+  python3-pyside2.qtwidgets
+  qtbase5-dev
+  qttools5-dev
+  shiboken2
+  swig
+  xvfb
+)
+
+# Install all packages
+sudo apt-get install -y --no-install-recommends "${packages[@]}"