fix(nixos): source homepage location from secrets

configs/nixos/modules/services/homepage.nix

@@ -134,6 +134,12 @@ in
       default = null;
       description = "Host headers accepted by Homepage. Defaults to matching address and route registry entries.";
     };
+
+    environmentFile = lib.mkOption {
+      type = lib.types.path;
+      default = "/run/secrets/homepage.env";
+      description = "Environment file passed to Homepage.";
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -141,6 +147,7 @@ in
       enable = true;
       openFirewall = true;
       inherit (cfg) listenPort;
+      environmentFiles = [ cfg.environmentFile ];
       allowedHosts = lib.concatStringsSep "," (if cfg.allowedHosts == null then derivedAllowedHosts else cfg.allowedHosts);
       services = homepageServices;
       widgets = [
@@ -150,6 +157,14 @@ in
             text = "tracion";
           };
         }
+        {
+          openmeteo = {
+            units = "metric";
+            latitude = "{{HOMEPAGE_VAR_LATITUDE}}";
+            longitude = "{{HOMEPAGE_VAR_LONGITUDE}}";
+            cache = 5;
+          };
+        }
         {
           datetime = {
             text_size = "xl";