feat(backend): MasterプロセスのPIDを書き出せるように (#11909)

packages/backend/src/config.ts

@@ -89,6 +89,7 @@ type Source = {
 	perChannelMaxNoteCacheCount?: number;
 	perUserNotificationsMaxCount?: number;
 	deactivateAntennaThreshold?: number;
+	pidFile: string;
 };
 
 export type Config = {
@@ -163,6 +164,7 @@ export type Config = {
 	perChannelMaxNoteCacheCount: number;
 	perUserNotificationsMaxCount: number;
 	deactivateAntennaThreshold: number;
+	pidFile: string;
 };
 
 const _filename = fileURLToPath(import.meta.url);
@@ -255,6 +257,7 @@ export function loadConfig(): Config {
 		perChannelMaxNoteCacheCount: config.perChannelMaxNoteCacheCount ?? 1000,
 		perUserNotificationsMaxCount: config.perUserNotificationsMaxCount ?? 300,
 		deactivateAntennaThreshold: config.deactivateAntennaThreshold ?? (1000 * 60 * 60 * 24 * 7),
+		pidFile: config.pidFile,
 	};
 }