handle dry-run mode in Config::get_builder_toml

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/config/config.rs

@@ -1212,6 +1212,10 @@ impl Config {
     }
 
     pub(crate) fn get_builder_toml(&self, build_name: &str) -> Result<TomlConfig, toml::de::Error> {
+        if self.dry_run() {
+            return Ok(TomlConfig::default());
+        }
+
         let builder_config_path =
             self.out.join(self.build.triple).join(build_name).join(BUILDER_CONFIG_FILENAME);
         Self::get_toml(&builder_config_path)