[Nix] Adds MCP config.

system/hosts/mcp/containers/searxng.nix

@@ -0,0 +1,27 @@
+
+{ config, pkgs, ... }:
+let inherit (import ./lib.nix config) mkContainer; in
+{
+  virtualisation.oci-containers.containers.searxng = mkContainer {
+    hostName = "search";
+    image = "docker.io/searxng/searxng:latest";
+    port = 8080;
+    public = true;
+    dependsOn = [
+      "valkey"
+    ];
+    homepageOpts = {
+      group = "Apps";
+      name = "SearXNG";
+      icon = "searxng.svg";
+      description = "Web search proxy";
+    };
+    volumes = [
+      "/tank/config/searxng:/etc/searxng"
+    ];
+    environment = {
+      SEARXNG_BASE_URL = "https://search.${config.domainName}";
+      SEARXNG_REDIS_URL = "redis://valkey:6379/0";
+    };
+  };
+}