nixos/community-builder: add user zimward

[zimward]

Having access to an aarch64 machine that will not OOM on nixpkgs-review would be very helpful. (And not having to wait a day to test a change for NixOS/nixos-hardware#1073)

[zowoq]

Apologies for not following up on this sooner.

We don't really have specific rules for allowing access to this machine but it is basically limited to people who are well known in the nixpkgs/nixos/etc community, is there somebody who is known (e.g. nixpkgs committer) who can vouch for you?

[zimward]

I interacted a bit with Atemu on Discourse and on my PR on FHSenv overriding, i also talked with lassulus once at c-base (though i don't think that should give me any credibility except confirming that i am in fact a real person).