feat: create mymx service

modules/mymx.nix

@@ -0,0 +1,40 @@
+{ config, pkgs, inputs, ... }:
+
+{
+  users.users.mymx = {
+    isSystemUser = true;
+    group = "mymx";
+    description = "MyMX webhook service user";
+  };
+  users.groups.mymx = {};
+
+  services.postgresql = {
+    enable = true;
+    ensureDatabases = [ "mymx" ];
+    ensureUsers = [{
+      name = "mymx";
+      ensureDBOwnership = true;
+    }];
+  };
+
+  systemd.services.mymx = {
+    description = "MyMX Webhook Receiver";
+    after = [ "postgresql.service" "network.target" ];
+    requires = [ "postgresql.service" ];
+    wantedBy = [ "multi-user.target" ];
+
+    environment = {
+      DATABASE_URL = "postgres:///mymx?host=/run/postgresql";
+      LISTEN_ADDR = "127.0.0.1:4002";
+      MYMX_WEBHOOK_SECRET = config.mySecrets.mymxWebhookSecret;
+    };
+
+    serviceConfig = {
+      ExecStart = "${inputs.mymx.packages.x86_64-linux.default}/bin/mymx-server";
+      User = "mymx";
+      Group = "mymx";
+      Restart = "on-failure";
+      RestartSec = 5;
+    };
+  };
+}