Add extension

[Bali0531Real]

Hello!
Could you please add the ext-mongodb extension?

I have a project right now and the licens system is using MongoDB, and i getting this error when trying to install mongodb/mongodb with composer.
mongodb/mongodb 1.16.0 requires ext-mongodb ^1.16.0 -> it is missing from your system. Install or enable PHP's mongodb extension.

Thanks!

[finnie2006]

Do you still need it, then i can make a custom image

[devilAPI]

I do still need it. Could you maybe also make a documentation on how to create custom images?