add wayland-proxy-virtwl module

checks/wayland-proxy-virtwl/default.nix

@@ -0,0 +1,29 @@
+import ../lib/test-base.nix ({ config, pkgs, lib, ... }: {
+  name = "wayland-proxy-virtwl";
+
+  nodes.machine = { self, ... }: {
+    imports = [
+      self.nixosModules.clanCore
+      {
+        clanCore.machineName = "machine";
+        clanCore.clanDir = ./.;
+      }
+    ];
+    services.wayland-proxy-virtwl.enable = true;
+
+    virtualisation.qemu.options = [
+      "-vga none -device virtio-gpu-rutabaga,cross-domain=on,hostmem=4G,wsi=headless"
+    ];
+    virtualisation.qemu.package = lib.mkForce self.packages.${pkgs.hostPlatform.system}.qemu-wayland;
+  };
+  # FIXME: currently we still see this error in the build sandbox,
+  # but it gives us some smoke test
+  # vm-test-run-wayland-proxy-virtwl> machine # qemu-kvm: The errno is ENOENT: No such file or directory
+  # vm-test-run-wayland-proxy-virtwl> machine # qemu-kvm: CHECK failed in rutabaga_cmd_submit_3d() ../hw/display/virtio-gpu-rutabaga.c:341
+  # vm-test-run-wayland-proxy-virtwl> machine # qemu-kvm: virtio_gpu_rutabaga_process_cmd: ctrl 0x207, error 0x1200
+  testScript = ''
+    start_all()
+    # use machinectl
+    machine.succeed("machinectl shell .host ${config.nodes.machine.systemd.package}/bin/systemctl --user start wayland-proxy-virtwl >&2")
+  '';
+})