nixos/pgadmin: Apply hardening options (#441052)

nixos/modules/services/admin/pgadmin.nix

···
           "initial_password:${cfg.initialPasswordFile}"
         ]
         ++ lib.optional cfg.emailServer.enable "email_password:${cfg.emailServer.passwordFile}";
+        AmbientCapabilities = "";
+        CapabilityBoundingSet = "";
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        PrivateTmp = true;
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectSystem = "full";
+        RemoveIPC = true;
+        RestrictAddressFamilies = [
+          "AF_UNIX"
+          "AF_INET"
+          "AF_INET6"
+        ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+        UMask = 27;
       };
     };