Allow mysql customizations

[nickbabcock]

This is #220 but for maria and mysql

[bsideup]

Hi @nickbabcock,

We just moved MariaDB to a separate repo:
https://github.com/testcontainers/testcontainers-java-module-mariadb

Any chance you can submit it there? :) Sorry about that :)

[nickbabcock]

Ok removed all mention and code related to mariadb from this PR.

I'll submit the mariadb PR shortly

[bsideup]

@nickbabcock I just think what if we move this to JDBCContainer so that every JDBC-based implementation will receive this functionality?

[nickbabcock]

Are you talking about adding abstract with methods to JdbcDatabaseContainer? Outside of them being environment variables, I can't see a a common way for setting these parameters across db containers.

EDIT: And I wouldn't know how to implement those methods for oracle-xe, as the docker page doesn't go into depth.

[kiview]

I prefer @bsideup's idea as well, using an abstract with method as you proposed. For those database who don't yet have this functionality and for which you don't know how to implement it right now, we could throw a UnsupportedOperationException and create an issue to support this in the future.