Fixed the same in docker compose

Author: iluhinsky

db/testing/docker/mssql/docker-compose.yaml

@@ -15,9 +15,6 @@ services:
       MSSQL_PID: Developer
       MSSQL_TCP_PORT: 1433
       MSSQL_COLLATION: SQL_Latin1_General_CP1_CI_AS
-      MSSQL_DB: perfkit_db_ci
-      MSSQL_USER: perfkit_db_runner
-      MSSQL_PASSWORD: MyP@ssw0rd123 # example value of a secret compliant with MS SQL Server password policy
       MSSQL_DATA_DIR: /var/opt/mssql/data
       MSSQL_LOG_DIR: /var/opt/mssql/log
       MSSQL_BACKUP_DIR: /var/opt/mssql/backup