Test PostgreSQL in CI

util/ci/common.sh

@@ -3,7 +3,7 @@
 # Linux build only
 install_linux_deps() {
 	local pkgs=(
-		cmake gettext
+		cmake gettext postgresql
 		libpng-dev libjpeg-dev libxi-dev libgl1-mesa-dev
 		libsqlite3-dev libhiredis-dev libogg-dev libgmp-dev libvorbis-dev
 		libopenal-dev libpq-dev libleveldb-dev libcurl4-openssl-dev libzstd-dev
@@ -19,6 +19,12 @@ install_linux_deps() {
 
 	sudo apt-get update
 	sudo apt-get install -y --no-install-recommends "${pkgs[@]}" "$@"
+
+	sudo systemctl start postgresql.service
+	sudo -u postgres psql <<<"
+		CREATE USER minetest WITH PASSWORD 'minetest';
+		CREATE DATABASE minetest;
+	"
 }
 
 # macOS build only