Add docker.

nix/configuration/configuration.nix

@@ -39,6 +39,7 @@
     ./roles/bsnes
     ./roles/ssh
     ./roles/python
+    ./roles/docker
   ];
 
   nix.settings.experimental-features = [

nix/configuration/roles/docker/default.nix

@@ -0,0 +1,39 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  virtualisation.docker.enable = true;
+  virtualisation.docker.rootless = {
+    enable = true;
+    setSocketVariable = true;
+  };
+
+  environment.persistence."/state" = lib.mkIf (!config.me.buildingIso) {
+    hideMounts = true;
+    directories = [
+      {
+        directory = "/var/lib/docker";
+        user = "root";
+        group = "root";
+        mode = "0740";
+      }
+    ];
+    users.talexander = {
+      directories = [
+        {
+          directory = ".local/share/docker";
+          user = "talexander";
+          group = "talexander";
+          mode = "0740";
+        }
+      ];
+    };
+  };
+
+}