fix and clean out webserver

nix/os/devices/srv0.home-ch.stefanjunker.de/versions.tmpl.nix

@@ -9,26 +9,6 @@ in
 {
   inherit nixpkgs;
   "channels-nixos-stable" = nixpkgs;
-  "channels-nixos-21.05" = {
-    url = "https://github.com/NixOS/nixpkgs/";
-    ref = "nixos-21.05";
-    rev = "<% git ls-remote https://github.com/nixos/nixpkgs nixos-21.05 | awk '{ print $1 }' | tr -d '\n' -%>";
-  };
-  "channels-nixos-20.03" = {
-    url = "https://github.com/NixOS/nixpkgs/";
-    ref = "nixos-20.03";
-    rev = "<% git ls-remote https://github.com/nixos/nixpkgs nixos-20.03 | awk '{ print $1 }' | tr -d '\n' -%>";
-  };
-  "channels-nixos-19.09" = {
-    url = "https://github.com/NixOS/nixpkgs/";
-    ref = "nixos-19.09";
-    rev = "<% git ls-remote https://github.com/nixos/nixpkgs nixos-19.09 | awk '{ print $1 }' | tr -d '\n' -%>";
-  };
-  "channels-nixos-unstable" = {
-    url = "https://github.com/NixOS/nixpkgs/";
-    ref = "nixos-unstable";
-    rev = "<% git ls-remote https://github.com/nixos/nixpkgs nixos-unstable | awk '{ print $1 }' | tr -d '\n' -%>";
-  };
   "nixpkgs-master" = {
     url = "https://github.com/NixOS/nixpkgs/";
     ref = "master";

nix/os/modules/ddclient-ovh.nix

@@ -25,7 +25,7 @@ in {
         domains = [ cfg.domain ];
         use = "web";
         inherit (passwords.dyndns.${cfg.domain}) username;
-        passwordFile = builtins.toFile "" passwords.dyndns.${cfg.domain}.password;
+        passwordFile = builtins.toFile passwords.dyndns._filename passwords.dyndns.${cfg.domain}.password;
     };
   };
 }