build03/postgresql: move from modules/hydra

remove ensureDatabases as it isn't compatible with the hydra module

hosts/build03/configuration.nix

@@ -15,6 +15,7 @@
     inputs.self.nixosModules.hydra
     inputs.self.nixosModules.nur-update
     ./disko.nix
+    ./postgresql.nix
   ];
 
   systemd.network.networks."10-uplink".networkConfig.Address = "2a01:4f9:3b:2946::1/64";

hosts/build03/postgresql.nix

@@ -0,0 +1,10 @@
+{
+  services.postgresql = {
+    enable = true;
+    settings = {
+      max_connections = "300";
+      effective_cache_size = "4GB";
+      shared_buffers = "4GB";
+    };
+  };
+}

modules/nixos/hydra.nix

@@ -52,16 +52,6 @@
       '';
     };
 
-    services.postgresql = {
-      enable = true;
-      ensureDatabases = [ "hydra" ];
-      settings = {
-        max_connections = "300";
-        effective_cache_size = "4GB";
-        shared_buffers = "4GB";
-      };
-    };
-
     services.nginx.virtualHosts = {
       "hydra.nix-community.org" = {
         forceSSL = true;