[skip ci] add a CODEOWNERS file

[asomers]

Summary

Convert MAINTAINERS into a Github CODEOWNERS file. This will
automatically assign reviewers to some GH pull requests. The conversion
is not 1:1; some committers don't have Github accounts (e.g. adrian),
some functional areas don't neatly correspond to a set of files (e.g.
kqueue), and mailing lists can't be assigned as a reviewer (e.g.
secteam@). But it's a start.

MFC after: 2 weeks

[imp]

I love this, though in time we may need to change the usernames a little depending on where we land.

For now, this is great, since we don't have pull requests turned on in gitlab that I can see.

In the fullness of time, I'd love to see this autogenerated in part based on who has touched the files "lately" for the more active parts of the tree and add them as well. But that's in no way even close to a requirement today.

This also points out a problem with any migration to any platform: what to do about username, etc. Also not a problem here, but since you did the work to get us this far it adds to the list of issues we'll need an answer for. :)

[asomers]

In D30559#686263, @imp wrote:

I love this, though in time we may need to change the usernames a little depending on where we land.

For now, this is great, since we don't have pull requests turned on in gitlab that I can see.

Wait, what? Do we already have a gitlab instance somewhere?

In the fullness of time, I'd love to see this autogenerated in part based on who has touched the files "lately" for the more active parts of the tree and add them as well. But that's in no way even close to a requirement today.

This also points out a problem with any migration to any platform: what to do about username, etc. Also not a problem here, but since you did the work to get us this far it adds to the list of issues we'll need an answer for. :)

[imp]

In D30559#686269, @asomers wrote:

Wait, what? Do we already have a gitlab instance somewhere?

We publish to gitlab.com

[ceri]

In D30559#686274, @imp wrote:

In D30559#686269, @asomers wrote:

Wait, what? Do we already have a gitlab instance somewhere?

We publish to gitlab.com

github.com ?

[imp]

In D30559#686588, @ceri wrote:

In D30559#686274, @imp wrote:

In D30559#686269, @asomers wrote:

Wait, what? Do we already have a gitlab instance somewhere?

We publish to gitlab.com

github.com ?

We publish to both, and others as well, from the central cgit repo today, including gitlab.com, where one can do gitlab things with your freebsd, should you want to.