Allow building Directories that have other files

[PedroC88]

I have a folder with all my bicep templates, but the directory also has some documentation for the infrastructure and custom scripts that aren't bicep.

I would love an option to "Ignore non-bicep" files when using Directory build mode, instead of it just failing, or maybe an approach that allows me to give a wildcard path (like **/*.bicep) so that it only picks up bicep paths recursively.

Currently I understand I have two choices:

1. Further separate the non-bicep files from the templates
2. Build the many directories that only contain bicep files individually and into the same output folder

None are ideal.