Upgrade to nixos-21.05

Getting me closer to the latest GHC. This release also includes my own packages
that I submitted some time ago.

GHCJS is not present in 21.05 for some reason, but I think it's back in master,
so I might do another upgrade soon, but for now I just disabled my GHCJS
support. I'm not really using it anyway.

I also had to bring it string-quote, update nixos-mailserver, and a few other
things.

1 files changed, 1 insertions, 0 deletions

diff --git a/Biz/Cloud/Git.nix b/Biz/Cloud/Git.nix
index fd7c8a2..bc9812c 100644
--- a/Biz/Cloud/Git.nix
+++ b/Biz/Cloud/Git.nix
@@ -36,6 +36,7 @@ in {
   # git group
   users.users = {
     gitDaemon = {
+      isSystemUser = true;
       description = "Git daemon user";
       extraGroups = [ "git" ];
     };