nixos/firefox-syncserver: init

Regular tests of this service make it easier to notice when and why it
broke.

nixos/tests/all-tests.nix

@@ -569,6 +569,7 @@ in
     imports = [ ./firefox.nix ];
     _module.args.firefoxPackage = pkgs.firefox-esr-140;
   };
+  firefox-syncserver = runTest ./firefox-syncserver.nix;
   firefoxpwa = runTest ./firefoxpwa.nix;
   firejail = runTest ./firejail.nix;
   firewall = runTest {

nixos/tests/firefox-syncserver.nix

@@ -0,0 +1,32 @@
+{
+  pkgs,
+  ...
+}:
+
+{
+  name = "firefox-syncserver";
+  nodes.machine = {
+    services.mysql = {
+      enable = true;
+      package = pkgs.mariadb;
+    };
+
+    services.firefox-syncserver = {
+      enable = true;
+      secrets = pkgs.writeText "secret" "this-is-a-test";
+      singleNode = {
+        enable = true;
+        hostname = "firefox-syncserver.local";
+        capacity = 1;
+      };
+    };
+  };
+
+  testScript = ''
+    machine.wait_for_unit("firefox-syncserver.service")
+    machine.wait_for_open_port(5000)
+
+    machine.wait_until_succeeds("curl --fail http://127.0.0.1:5000")
+
+  '';
+}