just derive Default

Signed-off-by: keisku <[email protected]>

src/runtime/process.rs

@@ -556,7 +556,9 @@ impl Default for LinuxSchedulerFlag {
     }
 }
 
-#[derive(Builder, Clone, Debug, Deserialize, Getters, Setters, Eq, PartialEq, Serialize)]
+#[derive(
+    Builder, Clone, Debug, Default, Deserialize, Getters, Setters, Eq, PartialEq, Serialize,
+)]
 #[builder(
     default,
     pattern = "owned",
@@ -580,12 +582,3 @@ pub struct ExecCPUAffinity {
     /// the container's default CPU affinity, as defined by cpu.cpus property, is used.
     cpu_affinity_final: Option<String>,
 }
-
-impl Default for ExecCPUAffinity {
-    fn default() -> Self {
-        Self {
-            cpu_affinity_initial: None,
-            cpu_affinity_final: None,
-        }
-    }
-}