consolidate hci modules

flake.nix

@@ -77,7 +77,7 @@
           default = self.lib.mkMacosSystem {
             imports = [
               self.darwinModules.default # Defined in nix-darwin/default.nix
-              ./nix-darwin/hercules.nix
+              ./nixos/hercules.nix
               ./systems/darwin.nix
             ];
           };

nix-darwin/hercules.nix

@@ -1,11 +0,0 @@
-{ config, lib, pkgs, inputs, system, ... }:
-
-{
-  # TODO: use agenix to manage
-  # - secrets
-  # - ssh keys
-  services.hercules-ci-agent = {
-    enable = true;
-    package = inputs.hci.packages.${system}.hercules-ci-agent;
-  };
-}

nixos/hercules.nix

@@ -1,6 +1,9 @@
 { pkgs, lib, inputs, system, ... }:
 
 {
+  # TODO: use agenix to manage
+  # - secrets
+  # - ssh keys
   services.hercules-ci-agent = {
     enable = true;
     # nixpkgs may not always have the latest HCI.
@@ -10,11 +13,7 @@
   # Regularly optimize nix store if using CI, because CI use can produce *lots*
   # of derivations.
   nix.gc = {
-    automatic = true;
-    dates = "weekly";
-    # NOTE: If the repos that use cache are updated as often as once a week (eg:
-    # flake.lock update action?), its cache should not be invalidated over time
-    # of idle periods.
+    automatic = ! pkgs.stdenv.isDarwin;  # Enable only on Linux
     options = "--delete-older-than 90d";
   };
 }