Docker-compose stops the container after entrypoint is done - sql-server

Question

I need sql server container with some database. I've prepared the following dockerfile:
FROM microsoft/mssql-server-linux:latest
ENV ACCEPT_EULA Y
ENV SA_PASSWORD yourStrong(!)Password
WORKDIR sqlserver
COPY load_db.sh load_db.sh
COPY /resources/sql/ sql
ENTRYPOINT ./load_db.sh
So it runs load_db.sh:
#!/usr/bin/env bash
SERVER_OUT=/var/log/sqlserver.out
TIMEOUT=90
/opt/mssql/bin/sqlservr &>${SERVER_OUT} &
function server_ready() {
grep -q -F 'Recovery is complete.' ${SERVER_OUT}
}
echo 'Wait until Microsoft SQL Server is up'
for (( i=0; i<${TIMEOUT}; i++ )); do
sleep 1
if server_ready; then
break
fi
done
echo 'Microsoft SQL Server is up'
/opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P ${SA_PASSWORD} -Q "CREATE DATABASE MarketDataService;"
/opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P ${SA_PASSWORD} -d MarketDataService -i sql/2018.0100.000000001.Add_Layout_table.sql
To run it I've prepared the followinf docker-compose file:
services:
db:
build:
context: .
dockerfile: Dockerfile-db
ports:
- 1433:1433
When I try to run docker-compose up --build it looks okay.
I have output:
db_1 | Wait until Microsoft SQL Server is up
db_1 | Microsoft SQL Server is up
db_1 |
db_1 | (3 rows affected)
But after it is exited...
amptest_db_1 exited with code 0
To solve it I've tried to add tty: true but it doesn't make sense. The same output. How can I keep alive my container by docker-compose? Here I've found tail -F anything. It works but looks terrible. Is there a better way?
Upd: I've stayed with tail -F '/var/log/sqlserver.out'