cluster/simulacrum: expose checks

cluster/part.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     ./catalog
+    ./simulacrum/checks.nix
   ];
 
   options.cluster = lib.mkOption {

cluster/simulacrum/checks.nix

@@ -0,0 +1,16 @@
+{ config, extendModules, lib, ... }:
+
+{
+  perSystem = { pkgs, system, ... }: {
+    checks = lib.mkIf (system == "x86_64-linux") (lib.mapAttrs' (name: svc: let
+      runSimulacrum = pkgs.callPackage ./. {
+        inherit config extendModules;
+      };
+    in {
+      name = "simulacrum-${name}";
+      value = runSimulacrum {
+        service = name;
+      };
+    }) (lib.filterAttrs (_: svc: svc.simulacrum.enable) config.cluster.config.services));
+  };
+}