Support for Debian "trixie" release in docker-outside-of-docker feature

[dalybrown]

Hello,

Is there a reason why the testing release of Debian (trixie or sid) is not supported in this list?

https://github.com/devcontainers/features/blob/648c8d56b9ec4f90cb9d754cd532a9d2e08c0674/src/docker-outside-of-docker/install.sh#L23

I couldn't find any information on why the codename needs to be checked. For development, we like to use the sid repository for many packages, but that will update our /etc/os-release information to trixie (currently) and therefore won't be supported. Consequently, the feature can't be installed.

Can we add trixie to this list? Thanks!