-f, --file <FILE> [ATTRPATH]
              Path to file with an optional attribute path.
              [env: NH_FILE=/etc/nixos/configuration.nix]
              [env: NH_ATTRP=]

        services.nextcloud = {
          enable = true;
          package = pkgs.nextcloud31;
          settings.trusted_proxies = [ ... ];
          hostName = "...";
          config.adminpassFile = "/etc/nextcloud-admin-pass";
          config.dbtype = "sqlite";
        };