postgresql/module.nix: add postgres user with permissions

modules/services/postgresql/module.nix

@@ -6,7 +6,7 @@
 }: let
   inherit (lib.modules) mkIf;
   inherit (lib.options) mkEnableOption;
-  cfg = config.modules.sytem.services.database.postgresql;
+  cfg = config.modules.system.services.database.postgresql;
 in {
   options.modules.system.services.database.postgresql.enable = mkEnableOption "postgresql";
 
@@ -28,6 +28,16 @@ in {
       ];
 
       ensureUsers = [
+        {
+          name = "postgres";
+          ensureClauses = {
+            superuser = true;
+            login = true;
+            createrole = true;
+            createdb = true;
+            replication = true;
+          };
+        }
         {
           name = "git";
           ensureDBOwnership = true;
@@ -35,7 +45,7 @@ in {
       ];
       settings = {
         # taken from https://pgconfigurator.cybertec.at/
-         
+
         # Connectivity
         max_connections = 100;
         superuser_reserved_connections = 3;