feat: fix wrtagweb api key

Signed-off-by: Lander Van den Bulcke <landervandenbulcke@gmail.com>

modules/nixos/wrtagweb.nix

@@ -29,6 +29,13 @@ in
         '';
       };
 
+      envFile = lib.mkOption {
+        type = lib.types.path;
+        description = ''
+          File with environment variables for wrtagweb
+        '';
+      };
+
     };
   };
 
@@ -47,6 +54,7 @@ in
       serviceConfig = {
         User = "wrtagweb";
         ExecStart = "${pkgs.unstable.wrtag}/bin/wrtagweb -config-path ${settingsFormat.generate "wrtagweb" cfg.settings}";
+        EnvironmentFile = cfg.envFile;
       };
     };
   };