meta(mariadb): add mariadb to CI #840

Job	Run time
Postgres (Node 10, Sequelize 5)	9m 8s
MariaDB (Node 10, Sequelize 5)	1m 5s
MySQL (Node 10, Sequelize 5)	7m 59s
Postgres (Node 10, Sequelize latest)	8m 7s
MariaDB (Node 10, Sequelize latest)	1m 3s
MySQL (Node 10, Sequelize latest)	8m 12s
Postgres (Node 16, Sequelize 5)	8m 55s
Postgres (Node 16, Sequelize latest)	7m 32s
MySQL (Node 16, Sequelize 5)	7m 29s
MySQL (Node 16, Sequelize latest)	7m 45s
MariaDB (Node 16, Sequelize 5)	57s
MariaDB (Node 16, Sequelize latest)	1m 5s
SQLite (Node 10, Sequelize 5)	7m 5s
SQLite (Node 10, Sequelize latest)	7m 3s
SQLite (Node 16, Sequelize 5)	8m 18s
SQLite (Node 16, Sequelize latest)	9m 18s
Release	0s
	1h 41m 1s

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