Merge pull request 'Add docker' (#8) from feature/docker into master

Reviewed-on: #8

systems/gandalf/default.nix

@@ -13,6 +13,7 @@
       ../modules/obs-studio.nix
       ../modules/garbage-collection.nix
       ../modules/printing.nix
+      ../modules/docker.nix
     ];
 
   boot.loader.systemd-boot.enable = true;

systems/modules/docker.nix

@@ -0,0 +1,7 @@
+{ config, pkgs, ... }:
+
+{
+  virtualisation.docker.enable = true;
+
+  users.users.avravels.extraGroups = [ "docker" ];
+}