add ci.nix

ci.nix

@@ -0,0 +1,24 @@
+let
+  krops = ./.;
+
+  lib = import "${krops}/lib";
+  pkgs = import "${krops}/pkgs" {};
+
+  source = lib.evalSource [{
+    nixos-config.file = toString (pkgs.writeText "nixos-config" ''
+      { pkgs, ... }: {
+
+        fileSystems."/" = { device = "/dev/sda1"; };
+        boot.loader.systemd-boot.enable = true;
+        services.openssh.enable = true;
+        environment.systemPackages = [ pkgs.git ];
+      }
+    '');
+  }];
+in {
+  test = pkgs.krops.writeTest "test" {
+    force = true;
+    source = source;
+    target = "${lib.getEnv "HOME"}/krops-test";
+  };
+}