feat: add health-check (#21)

Dockerfile

@@ -8,4 +8,7 @@ WORKDIR /app
 COPY . .
 RUN npm ci --quiet
 RUN npm run build
+
+HEALTHCHECK --interval=12s --timeout=12s --start-period=10s CMD npm run healthcheck
+
 CMD [ "npm", "start" ]

package.json

@@ -7,7 +7,8 @@
     "build": "aegir build --bundle false",
     "start": "node dist/src/index.js",
     "start:dev": "npm run build && node dist/src/index.js",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "healthcheck": "node dist/src/healthcheck.js"
   },
   "type": "module",
   "repository": {

src/healthcheck.ts

@@ -0,0 +1,9 @@
+#!/usr/bin/env node
+/**
+ * This healthcheck script is used to check if the server is running and healthy.
+ */
+const rootReq = await fetch(`http://localhost:${process.env.PORT ?? 8080}`, { method: 'GET' })
+const status = rootReq.status
+// eslint-disable-next-line no-console
+console.log(`Healthcheck status: ${status}`)
+process.exit(status === 200 ? 0 : 1)