feat(wpcarro/ava): Support docker

Run the Docker daemon on ava. Again: because startup.

Change-Id: I944ae097a1ba239715c153777177a09579a6e186
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5454
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>

users/wpcarro/nixos/ava/default.nix

@@ -62,6 +62,7 @@ in
     extraGroups = [
       "networkmanager"
       "wheel"
+      "docker"
     ];
     shell = pkgs.fish;
   };
@@ -82,6 +83,8 @@ in
 
   programs = wpcarro.common.programs;
 
+  virtualisation.docker.enable = true;
+
   environment.variables = {
     EDITOR = "emacsclient";
     ALTERNATE_EDITOR = "emacs -q -nw";