deb: fix bug in find_dsc_file

src/context/local.rs

@@ -78,6 +78,10 @@ impl ContextDriver for LocalDriver {
     fn write_file(&self, path: &Path, content: &str) -> io::Result<()> {
         std::fs::write(path, content)
     }
+
+    fn exists(&self, path: &Path) -> io::Result<bool> {
+        Ok(path.exists())
+    }
 }
 
 fn copy_dir_recursive(src: &Path, dest: &Path) -> io::Result<()> {