Easier MariaDB support in tests

misc/DatabaseTesting.md

@@ -45,4 +45,21 @@ Run tests:
 Stop PostgreSQL:
 
     docker rm -f postgres
+    
+MariaDB
+-------
+
+The simplest way to test with MariaDB is to use the official [MariaDB docker image](https://registry.hub.docker.com/_/mariadb/).
+
+Start MariaDB:
+
+    docker run --name mariadb -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=keycloak -e MYSQL_USER=keycloak -e MYSQL_PASSWORD=keycloak -d mariadb:10.1
+   
+Run tests:
+
+    mvn install -Dkeycloak.connectionsJpa.url=jdbc:mariadb://`docker inspect --format '{{ .NetworkSettings.IPAddress }}' mariadb`/keycloak -Dkeycloak.connectionsJpa.driver=org.mariadb.jdbc.Driver -Dkeycloak.connectionsJpa.user=keycloak -Dkeycloak.connectionsJpa.password=keycloak    
+    
+Stop MySQl:
+
+    docker rm -f mariadb