Add a docker-compose example file (#1943) (#2666)

Co-authored-by: Masahiro Ikeda <masahiro.ikeda.us@hco.ntt.co.jp>

scripts/docker-compose_test.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+
+# this is a shortcut script to avoid duplication in CI
+set -eux -o pipefail
+
+SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+COMPOSE_FILE=$SCRIPT_DIR/../docker-compose/docker-compose.yml
+
+COMPUTE_CONTAINER_NAME=dockercompose_compute_1
+SQL="CREATE TABLE t(key int primary key, value text); insert into t values(1,1); select * from t;"
+PSQL_OPTION="-h localhost -U cloud_admin -p 55433 -c '$SQL' postgres"
+
+cleanup() {
+	echo "show container information"
+	docker ps
+	docker-compose -f $COMPOSE_FILE logs
+	echo "stop containers..."
+	docker-compose -f $COMPOSE_FILE down
+}
+
+echo "clean up containers if exists"
+cleanup
+
+for pg_version in 14 15; do
+	echo "start containers (pg_version=$pg_version)."
+	PG_VERSION=$pg_version TAG=latest docker-compose -f $COMPOSE_FILE up --build -d
+
+	echo "wait until the compute is ready. timeout after 60s. "
+	cnt=0
+	while sleep 1; do
+		# check timeout
+		cnt=`expr $cnt + 1`
+		if [ $cnt -gt 60 ]; then
+			echo "timeout before the compute is ready."
+			cleanup
+			exit 1
+		fi
+
+		# check if the compute is ready
+		set +o pipefail
+		result=`docker-compose -f $COMPOSE_FILE logs "compute_is_ready" | grep "accepting connections" | wc -l`
+		set -o pipefail
+		if [ $result -eq 1 ]; then
+			echo "OK. The compute is ready to connect."
+			echo "execute simple queries."
+			docker exec -it $COMPUTE_CONTAINER_NAME /bin/bash -c "psql $PSQL_OPTION"
+			cleanup
+			break
+		fi
+	done
+done