modules/nixos: add comin

modules/nixos/common/comin.nix

@@ -0,0 +1,19 @@
+{ inputs, lib, ... }:
+{
+  imports = [
+    inputs.comin.nixosModules.comin
+  ];
+
+  services.comin = {
+    enable = lib.mkDefault false;
+    remotes = [
+      {
+        url = "https://github.com/nix-community/infra.git";
+        name = "origin";
+        poller.period = 300; # every 5 minutes
+        branches.main.name = "master";
+        branches.testing.name = ""; # disable testing branch
+      }
+    ];
+  };
+}

modules/nixos/common/default.nix

@@ -2,6 +2,7 @@
 {
   imports = [
     ./auto-upgrade.nix
+    ./comin.nix
     ../../shared/known-hosts.nix
     ../../shared/nix-daemon.nix
     ./reboot.nix