Povide a path for DBs other than postgres in docker images

[cjcolvar]

Description

The Dockerfile only installs postgresql libraries which works with the provided docker-compose.yml. At IU we use MySql/MariaDB instead of postgres so we need to modify the Dockerfile in order to install the mysql/mariadb libraries instead. It would be helpful if the Dockerfile had a build arg to specify which database is desired and only the needed libraries would be installed. Alternatively, the libraries for all of the possible database configurations could be installed which would avoid the need for custom building of the docker image when using a database other than postgresql.

Done Looks Like

• install all DB libraries (postgres and mysql)