feat: Add attic-client to x86_64-linux system

The attic-client has been added to the packages for the x86_64-linux system. This change enables interaction with the Attic distributed storage system, expanding the capabilities of this system setting.

systems/x86_64-linux/sgx-nixos/atticd.nix

@@ -1,5 +1,15 @@
 { pkgs, lib, config, ... }:
 {
+  services.postgresql = {
+    enable = true;
+    ensureDatabases = [ "attic" ];
+    ensureUsers = [{ name = "atticd"; }];
+  };
+
+  systemd.services.postgresql.postStart = lib.mkAfter ''
+    $PSQL -tAc 'ALTER DATABASE "attic" OWNER TO "atticd"'
+  '';
+
   environment.systemPackages = with pkgs; [
     attic-client
   ];
@@ -10,6 +20,8 @@
     credentialsFile = "/etc/atticd.env";
 
     settings = {
+      database.url = "postgresql:///attic?host=/run/postgresql";
+
       listen = "[::]:8080";
 
       # Data chunking