docs: function createDBIfNotExists() {
    const tmpClient = knexLib({
      client: 'pg',
      connection: {
        host: POSTGRES_HOST,
        user: POSTGRES_USER,
        password: POSTGRES_PASSWORD,
        database: 'postgres',
        port: POSTGRES_PORT
      },
      pool: { min: CONNECTION_POOL_MIN, max: CONNECTION_POOL_MAX }
    });
  
    // https://github.com/clay/amphora-storage-postgres/pull/7/files/16d3429767943a593ad9667b0d471fefc15088d3#diff-6a1e11a6146d3a5a01f955a44a2ac07a
    return tmpClient.raw('CREATE DATABASE ??', [POSTGRES_DB])
      .then(() => tmpClient.destroy())
      .then(connect);
  }