[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, 21 insertions, 0 deletions

diff --git a/nix/tests/common.nix b/nix/tests/common.nix
new file mode 100644
index 0000000..37abb5d
--- /dev/null
+++ b/nix/tests/common.nix
@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2024 Serokell <https://serokell.io/>
+#
+# SPDX-License-Identifier: MPL-2.0
+
+{inputs, pkgs, ...}: {
+  nix = {
+    registry.nixpkgs.flake = inputs.nixpkgs;
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+    settings = {
+      trusted-users = [ "root" "@wheel" ];
+      substituters = pkgs.lib.mkForce [];
+    };
+  };
+
+  virtualisation.graphics = false;
+  virtualisation.memorySize = 1536;
+  boot.loader.grub.enable = false;
+  documentation.enable = false;
+}