Update Dockerfile (#336)

Dockerfile

@@ -19,11 +19,22 @@ RUN yarn build
 # Create image by copying build artifacts
 FROM node:20-alpine as runner
 
+# Add curl for HEALTHCHECK
+RUN apk add --no-cache curl
+
 USER node
 
 WORKDIR /home/node
 COPY --chown=node:node --from=builder /builder/ ./
 
 ARG PORT=3000
+# Set PORT env var for next start and expose it
+ENV PORT=${PORT}
 EXPOSE ${PORT}
+
+# Add internal health check
+# Adjust path (e.g., /api/health) if necessary for your app's health endpoint
+HEALTHCHECK --interval=30s --timeout=5s --start-period=30s --retries=3 \
+  CMD curl --fail http://localhost:${PORT}/ || exit 1
+
 CMD ["yarn", "start"]