[OPS-1384] Introduce NixOS VM tests

Problem: Currently, the only way to test deploy-rs deployments is to
actually do a deployment to an existing NixOS instance (either in VM,
or a real machine) manually. This is a bit inconvenient and one can
forget to test changes when developing/reviewing deploy-rs changes.

Solution: Add NixOS VM tests.

1 files changed, 23 insertions, 0 deletions

diff --git a/nix/tests/server.nix b/nix/tests/server.nix
new file mode 100644
index 0000000..a8bbda6
--- /dev/null
+++ b/nix/tests/server.nix
@@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: 2024 Serokell <https://serokell.io/>
+#
+# SPDX-License-Identifier: MPL-2.0
+{ pkgs, ... }:
+{
+  nix.settings.trusted-users = [ "deploy" ];
+  users = let
+    inherit (import "${pkgs.path}/nixos/tests/ssh-keys.nix" pkgs) snakeOilPublicKey;
+  in {
+    mutableUsers = false;
+    users = {
+      deploy = {
+        password = "";
+        isNormalUser = true;
+        createHome = true;
+        openssh.authorizedKeys.keys = [ snakeOilPublicKey ];
+      };
+      root.openssh.authorizedKeys.keys = [ snakeOilPublicKey ];
+    };
+  };
+  services.openssh.enable = true;
+  virtualisation.writableStore = true;
+}