message: Skip serialization of mounts if its empty
diff: @@ -202,7 +202,7 @@ pub struct Manifest {
  #[serde(skip_serializing_if = "Option::is_none")]
  pub instances: Option<u32>,
  /// List of bind mounts and resources
  - #[serde(with = "MountsSerialization")]
  + #[serde(with = "MountsSerialization", skip_serializing_if = "HashMap::is_empty")]
  #[serde(default)]
  pub mounts: HashMap<PathBuf, Mount>,
  }
  