Generate a config file for the use with rclone

lib/modules/rclone.nix

@@ -2,6 +2,7 @@
 let
   cfg = config.programs.rclone;
   targetName = "rclone";
+  mkIfNotNull = value: result: lib.mkIf (value != null) result;
 
   mkSystemdDependencyOption =
     { default, global ? false, ... }: lib.mkOption {
@@ -40,7 +41,7 @@ let
     };
 
   mkWebdavProvider = { vendor, vendorName }: (
-    mkProvider {
+    { providerOptions, ... }@args: mkProvider {
       displayName = vendorName;
 
       options = {
@@ -73,7 +74,16 @@ let
           default = null;
         };
       };
-    });
+
+      config = lib.mkMerge [
+        {
+          inherit vendor;
+          url = providerOptions.url;
+        }
+        (mkIfNotNull providerOptions.username { user = providerOptions.username; })
+        (mkIfNotNull providerOptions.obscuredPassword { pass = providerOptions.obscuredPassword; })
+      ];
+    } args);
 
   syncProviders = {
     nextcloud = mkProvider {};
@@ -205,6 +215,9 @@ in {
 
                   ExecStart =
                     let
+                      configFile = pkgs.writeText
+                        "${serviceName}.conf"
+                        (lib.generators.toINI { } { name = sync.config; });
                       script = pkgs.writeShellScriptBin serviceName ''
                         ${sync.secretsScript}
                         bash -c echo hello world