feat: add healthcheck endpoint

Dockerfile

@@ -31,7 +31,7 @@ RUN npm run build  && npm prune --production
 # Stage 5: Final image
 FROM node:19-slim AS runner
 ENV NODE_ENV=docker
-RUN apt-get update && apt-get install -y openssl
+RUN apt-get update && apt-get install -y curl openssl
 
 WORKDIR /opt/app/frontend
 COPY --from=frontend-builder /opt/app/public ./public
@@ -47,4 +47,6 @@ COPY --from=backend-builder /opt/app/package.json ./
 
 WORKDIR /opt/app
 EXPOSE 3000
+HEALTHCHECK --interval=10s --timeout=3s CMD curl -f http://localhost:3000/api/health || exit 1
+
 CMD cp -rn /tmp/img /opt/app/frontend/public && node frontend/server.js & cd backend && npm run prod

frontend/src/pages/api/health.tsx

@@ -0,0 +1,14 @@
+import axios from "axios";
+import { NextApiRequest, NextApiResponse } from "next";
+import getConfig from "next/config";
+
+const { apiURL } = getConfig().serverRuntimeConfig;
+
+export default async (req: NextApiRequest, res: NextApiResponse) => {
+  const apiStatus = await axios
+    .get(`${apiURL}/api/configs`)
+    .then(() => "OK")
+    .catch(() => "ERROR");
+
+  res.status(apiStatus == "OK" ? 200 : 500).send(apiStatus);
+};