feat(gateway): runtime_config_key in config

crates/gateway/src/main.rs

@@ -35,7 +35,11 @@ async fn real_main() -> anyhow::Result<()> {
     let runtime_config = Arc::new(
         RuntimeConfig::new(
             redis.clone(),
-            format!("gateway:{}", cluster_config().node_id),
+            format!(
+                "{}:{}",
+                libpk::config.runtime_config_key.as_ref().unwrap(),
+                cluster_config().node_id
+            ),
         )
         .await?,
     );

crates/libpk/src/_config.rs

@@ -116,6 +116,9 @@ pub struct PKConfig {
     #[serde(default = "_json_log_default")]
     pub(crate) json_log: bool,
 
+    #[serde(default)]
+    pub runtime_config_key: Option<String>,
+
     #[serde(default)]
     pub sentry_url: Option<String>,
 }