added factorio server to cirrostratus.

configs/nixos/docker.nix

@@ -0,0 +1,15 @@
+{
+  inputs,
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  virtualisation.docker = {
+    enable = true;
+    daemon.settings = {
+      userland-proxy = false;
+    };
+  };
+  users.users.${config.host.user}.extraGroups = ["docker"];
+}

configs/nixos/factorio-docker.nix

@@ -0,0 +1,26 @@
+{
+  inputs,
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  virtualisation.oci-containers = {
+    backend = "docker";
+    containers.factorio = {
+      image = "factoriotools/factorio:stable";
+      volumes = ["/storage/factorio:/factorio"];
+      hostname = "factorio";
+      ports = [
+        "34197:34197"
+        "27015:27015"
+      ];
+      environment={
+        UPDATE_MODS_ON_START="true";
+      };
+    };
+  };
+  imports = [
+    ./docker.nix
+  ];
+}