feat: add health check endpoint

fly.toml

@@ -17,7 +17,7 @@ min_machines_running = 0
 
 [[http_service.checks]]
 method = "GET"
-path = "/"
-grace_period = "4s"
-interval = "10s"
-timeout = "20s"
+path = "/health"
+grace_period = "3s"
+interval = "6s"
+timeout = "12s"

src/routes/health/+server.js

@@ -0,0 +1,7 @@
+import assert from 'node:assert/strict';
+
+export function GET({ locals: { ctx } }) {
+    assert(typeof ctx !== 'undefined');
+    ctx.logger.info('health check pinged');
+    return new Response(null, { status: 200 });
+}