Replace travis with github actions (#9641)

* Move outside of travis to Github actions

This will permit to have better integrated CI workflow than the previous
travis one.

util/ci/common.sh

@@ -0,0 +1,45 @@
+#!/bin/bash -e
+
+set_linux_compiler_env() {
+	if [[ "${COMPILER}" == "gcc-6" ]]; then
+		export CC=gcc-6
+		export CXX=g++-6
+	elif [[ "${COMPILER}" == "gcc-8" ]]; then
+		export CC=gcc-8
+		export CXX=g++-8
+	elif [[ "${COMPILER}" == "clang-3.9" ]]; then
+		export CC=clang-3.9
+		export CXX=clang++-3.9
+	elif [[ "${COMPILER}" == "clang-9" ]]; then
+		export CC=clang-9
+		export CXX=clang++-9
+	fi
+}
+
+# Linux build only
+install_linux_deps() {
+	local pkgs=(libirrlicht-dev cmake libbz2-dev libpng-dev \
+		libjpeg-dev libxxf86vm-dev libgl1-mesa-dev libsqlite3-dev \
+		libhiredis-dev libogg-dev libgmp-dev libvorbis-dev libopenal-dev \
+		gettext libpq-dev postgresql-server-dev-all libleveldb-dev \
+		libcurl4-openssl-dev)
+	# for better coverage, build some jobs with luajit
+	if [ -n "$WITH_LUAJIT" ]; then
+		pkgs+=(libluajit-5.1-dev)
+	fi
+
+	sudo apt-get update
+	sudo apt-get install -y --no-install-recommends ${pkgs[@]}
+}
+
+# Mac OSX build only
+install_macosx_deps() {
+	brew update
+	brew install freetype gettext hiredis irrlicht leveldb libogg libvorbis luajit
+	if brew ls | grep -q jpeg; then
+		brew upgrade jpeg
+	else
+		brew install jpeg
+	fi
+	#brew upgrade postgresql
+}