fix: interpolate the repository URL in the download message

src/cli/Deploy.vala

@@ -563,7 +563,7 @@ private int deploy_provision_repositories(Vector<string> overrides, string conte
                 var filename = path.substring(path.last_index_of("/") + 1);
                 var local = Path.build_filename(destination, filename);
                 try {
-                    printerr("Downloading repository descriptor from \"$path\"...\n");
+                    printerr(@"Downloading repository descriptor from \"$path\"...\n");
                     File.new_for_uri(path).copy(File.new_for_path(local), FileCopyFlags.OVERWRITE);
                 }
                 catch(Error e) {