Move c0bw3b to trusted users

[c0bw3b]

Politely asking 😺
it would allow me to check Linux+Darwin package updates before merging into nixpkgs.

I understood that Darwin builds are not sandboxed properly so trusted users should be extra careful when invoking ofBorg.
I also keep in mind that builders have limited resources and that I should check https://monitoring.nix.ci before launching a potentially heavy job.

/cc @grahamc @LnL7 @Mic92

[7c6f434c]

I understood that Darwin builds are not sandboxed properly so trusted users should be extra careful when invoking ofBorg.

… and opening a PR not marked as WIP might also invoke ofBorg without an explicit request. </pointless-nitpick> This is just a nitpick about the wording of the list of caveats, in case it ever gets linked from outside as an example of a list of caveats.

[c0bw3b]

Thanks Graham