Initiative home page:

https://bestpractices.coreinfrastructure.org/

There are some criteria:

https://github.com/linuxfoundation/cii-best-practices-badge/blob/master/doc/criteria.md

which are (almost) met by VyOS project. I think it's a good idea to prepare and submit for a badge - it's a good PR and external review is also useful, I think.