Fix failing test pipeline

[mprokopov]

Fix the issue with GitHub actions, which probably caused by some timeout database needs for connection.

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)

Another issue could be in usage DB_HOST: "127.0.0.1", that tells MySQL client to use network instead of a socket.

It would be nice to decomplect a pipeline a bit. Use a separate container to launch a database sidecar.