feat: without cluster in trigger release

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/flux-releaser/src/services/file_reader.rs

@@ -1,4 +1,4 @@
-#[derive(Clone)]
+#[derive(Clone, Default)]
 pub struct FileReader {}
 
 use std::{
@@ -12,7 +12,7 @@ use anyhow::{anyhow, Context};
 
 impl FileReader {
     pub fn new() -> Self {
-        Self {}
+        Self::default()
     }
 
     pub async fn read_files(&self, location: PathBuf) -> anyhow::Result<Files> {