[Nix] Adds MCP config.

system/hosts/mcp/containers/atomicserver.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, ... }:
+let
+  inherit (import ./lib.nix config) mkContainer;
+in {
+  virtualisation.oci-containers.containers.atomicserver = mkContainer {
+    image = "joepmeneer/atomic-server";
+    hostName = "atomic";
+    port = 80;
+    volumes = [
+      "/tank/atomicserver:/atomic-storage"
+    ];
+    environment = {
+      ATOMIC_INITIALIZE = "true";
+      ATOMIC_SERVER_URL = "https://atomic.havenisms.com";
+      ATOMIC_DOMAIN = "atomic.havenisms.com";
+      ATOMIC_HTTPS = "false";
+    };
+    homepageOpts = {
+      group = "Apps";
+      name = "Atomic Server";
+      icon = "atomicserver.svg";
+      description = "Atomic Knowledge Management System";
+    };
+  };
+}