upgrade-postgresql: Check the version of docker-compose first.

We use `docker-compose up --wait` which was introduced in
docker-compose version 2.1.1; check the version first.

Author: alexmv

upgrade-postgresql

@@ -9,6 +9,13 @@ if ! command -v yq >/dev/null; then
 	exit 1
 fi
 
+# Require docker-compose 2.1.1 or higher, for `docker-compose up --wait`
+docker_compose_version=$(docker-compose --version --short)
+if [ "$(docker_compose_version)" = "$(echo -e "2.1.0\n${docker_compose_version}" | sort -V | head -n1)" ]; then
+	echo "Your docker-compose is too old (${docker_compose_version}); upgrade to at least 2.1.1."
+	exit 1
+fi
+
 image=$(yq ".services.database.image" docker-compose.yml)
 if [[ $image =~ ^zulip/zulip-postgresql:([0-9]+)$ ]]; then
 	old_version="${BASH_REMATCH[1]}"