feat(tasktree): add GitHub disaster recovery backups

cmd/hwlab-tasktree-worker/main.ts

@@ -3,9 +3,13 @@ import { NativeConnection, Worker } from "@temporalio/worker";
 import path from "node:path";
 
 import { createTaskTreeActivities } from "../../internal/tasktree/activities.ts";
+import { startTaskTreeBackupScheduler } from "../../internal/tasktree/backup.ts";
 import { taskTreeRuntime } from "../../internal/tasktree/runtime.ts";
 
-const runtime = taskTreeRuntime();
+const runtime = taskTreeRuntime({
+  ...process.env,
+  TASKTREE_BACKUP_WORKTREE: process.env.TASKTREE_BACKUP_WORKTREE ?? ".state/tasktree/backup-repo-worker",
+});
 if (!runtime.temporalAddress) throw new Error("TASKTREE_TEMPORAL_ADDRESS is required");
 await runtime.store.ensureSchema();
 const connection = await NativeConnection.connect({ address: runtime.temporalAddress });
@@ -17,13 +21,22 @@ const worker = await Worker.create({
   activities: createTaskTreeActivities(runtime.store)
 });
 const healthPort = Number.parseInt(process.env.TASKTREE_WORKER_HEALTH_PORT || "6674", 10);
+const backupScheduler = startTaskTreeBackupScheduler(runtime.backup, (result) => {
+  process.stdout.write(`${JSON.stringify({ serviceId: "hwlab-tasktree-worker", ...result })}\n`);
+});
 const health = Bun.serve({
   hostname: process.env.TASKTREE_WORKER_HEALTH_HOST || "0.0.0.0",
   port: healthPort,
-  fetch(request) {
+  async fetch(request) {
     const pathname = new URL(request.url).pathname;
     if (pathname !== "/health/live" && pathname !== "/health/ready") return Response.json({ ok: false, error: "not_found" }, { status: 404 });
-    return Response.json({ ok: true, serviceId: "hwlab-tasktree-worker", namespace: runtime.temporalNamespace, taskQueue: runtime.taskQueue });
+    return Response.json({
+      ok: true,
+      serviceId: "hwlab-tasktree-worker",
+      namespace: runtime.temporalNamespace,
+      taskQueue: runtime.taskQueue,
+      backup: await runtime.backup.status(),
+    });
   }
 });
 
@@ -32,6 +45,7 @@ for (const signal of ["SIGINT", "SIGTERM"] as const) process.once(signal, () =>
 try {
   await worker.run();
 } finally {
+  await backupScheduler.stop();
   health.stop(true);
   await connection.close();
   await runtime.store.close();