feat: add /health endpoint and Docker healthcheck

docker-compose.yml

@@ -14,6 +14,12 @@ services:
       - "8080"
     volumes:
       - ${DATA_VOLUME:-data}:/data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 10m
+      timeout: 5s
+      retries: 3
+      start_period: 15s
 
 volumes:
   data:

server.ts

@@ -16,6 +16,10 @@ router.get("/", (ctx) => {
   ctx.response.body = "Hello world";
 });
 
+router.get("/health", (ctx) => {
+  ctx.response.body = { status: "ok" };
+});
+
 router.get("/notes", (ctx) => {
   const cursor = ctx.request.url.searchParams.get("cursor") ?? undefined;
   const limit = Number(ctx.request.url.searchParams.get("limit")) || PAGINATION;