feat(sterni/ingeborg): set up monitoring via netdata

Main objective was to get SMART/md monitoring working, alerts go (via
some awful glue code) to #sterni.lv on hackint. Bot nick should also be
registered in the future.

Change-Id: Ia73c5a64ee9f6df62f5fbe21fc1606477e3d6e73
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10174
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

users/sterni/modules/common.nix

@@ -65,6 +65,7 @@ in
       pkgs.htop
       pkgs.foot.terminfo
       pkgs.vim
+      pkgs.smartmontools
     ];
 
     security.acme = {