[GEB] adding a Testcontainers module to Geb

Hi All,

After seeing how Grails was testing with Geb and Testcontainers using 
their Grails Geb Plugin [1].
I had some non-Grails projects to test with Geb so I created a 
standalone Geb-Container library [2] based on that plugin.
I modified it some to take out the Grails dependencies and it has worked 
out well.
I also setup a sample project for trying it out [3].

My thought was that it would make a good addition to Geb as a module and 
I wanted to get the your thoughts.


[1] https://github.com/apache/grails-core/tree/7.0.x/grails-geb
[2] https://github.com/cbmarcum/geb-container
[3] https://github.com/cbmarcum/geb-container-sample

Best regards,
Carl