.github: workflow for building Xservers and some drivers

Add a github workflow that builds the Xservers on Linux and also
runs build-test of several common drivers against xorg sdk.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

.github/scripts/ubuntu/install-pkg.sh

@@ -0,0 +1,95 @@
+#!/bin/bash
+
+set -e
+
+# Packages which are needed by this script, but not for the xserver build
+EPHEMERAL="
+	libexpat-dev
+	libgles2-mesa-dev
+	libxkbcommon-dev
+	x11-utils
+	x11-xserver-utils
+	xauth
+	xvfb
+"
+
+apt-get update
+
+apt-get install -y \
+	$EPHEMERAL \
+	autoconf \
+	automake \
+	build-essential \
+	ca-certificates \
+	libaudit-dev \
+	libbsd-dev \
+	libcairo2-dev \
+	libdbus-1-dev \
+	libdrm-dev \
+	libegl1-mesa-dev \
+	libepoxy-dev \
+	libevdev2 \
+	libexpat1 \
+	libffi-dev \
+	libgbm-dev \
+	libgcrypt-dev \
+	libgl1-mesa-dev \
+	libgles2 \
+	libglx-mesa0 \
+	libinput10 \
+	libinput-dev \
+	libnvidia-egl-wayland-dev \
+	libpciaccess-dev \
+	libpixman-1-dev \
+	libselinux1-dev \
+	libspice-protocol-dev \
+	libsystemd-dev \
+	libudev-dev \
+	libunwind-dev \
+	libx11-dev \
+	libx11-xcb-dev \
+	libxau-dev \
+	libxaw7-dev \
+	libxcb-glx0-dev \
+	libxcb-icccm4-dev \
+	libxcb-image0-dev \
+	libxcb-keysyms1-dev \
+	libxcb-randr0-dev \
+	libxcb-render-util0-dev \
+	libxcb-render0-dev \
+	libxcb-shape0-dev \
+	libxcb-shm0-dev \
+	libxcb-util0-dev \
+	libxcb-xf86dri0-dev \
+	libxcb-xkb-dev \
+	libxcb-xv0-dev \
+	libxcb1-dev \
+	libxdmcp-dev \
+	libxext-dev \
+	libxfixes-dev \
+	libxfont-dev \
+	libxi-dev \
+	libxinerama-dev \
+	libxkbcommon0 \
+	libxkbfile-dev \
+	libxmu-dev \
+	libxmuu-dev \
+	libxpm-dev \
+	libxrender-dev \
+	libxres-dev \
+	libxshmfence-dev \
+	libxt-dev \
+	libxtst-dev \
+	libxv-dev \
+	mesa-common-dev \
+	meson \
+	nettle-dev \
+	libpango1.0-dev \
+	pkg-config \
+	x11-xkb-utils \
+	xfonts-utils \
+	xkb-data \
+	xtrans-dev \
+	xutils-dev \
+	libxaw7-dev \
+	python3-mako