feat: implement multi-stage Dockerfile for deployment infrastructure

Co-Authored-By: Claude <noreply@anthropic.com>

cmd/cron/main.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/go-redis/redis/v8"
+
+	"trip-planner/internal/cache"
+	"trip-planner/internal/metrics"
+	"trip-planner/internal/yandex"
+)
+
+func main() {
+	redisClient := initRedis()
+	m := metrics.New()
+
+	apiKey := os.Getenv("YANDEX_API_KEY")
+	if apiKey == "" {
+		log.Fatal("YANDEX_API_KEY environment variable is not set")
+	}
+	yandexClient := yandex.NewClient(apiKey, yandex.WithMetrics(m))
+
+	// Define monitored stations
+	monitoredStations := []string{
+		// Add station IDs here
+	}
+
+	monitors := make([]*StationMonitor, 0, len(monitoredStations))
+	for _, stationID := range monitoredStations {
+		monitors = append(monitors, &StationMonitor{
+			ID:     stationID,
+			Yandex: yandexClient,
+			Cache:  cache.NewCacheStore(redisClient, m),
+		})
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	// Set up signal handling for graceful shutdown
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+
+	log.Println("Cron service starting, checking station statuses...")
+
+	// Run the station status check
+	if err := ProcessAllStations(ctx, monitors); err != nil {
+		log.Printf("ERROR: failed to process stations: %v", err)
+	}
+
+	// Wait for signal to exit
+	<-sigChan
+	log.Println("Cron service shutting down...")
+}
+
+// initRedis initializes a Redis client connection.
+func initRedis() *redis.Client {
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     os.Getenv("REDIS_ADDR"),
+		Password: "",
+		DB:       0,
+	})
+	return rdb
+}

cmd/cron/station_status.go

@@ -1,4 +1,4 @@
-package cron
+package main
 
 import (
 	"context"

cmd/cron/station_status_test.go

@@ -1,4 +1,4 @@
-package cron
+package main
 
 import (
 	"context"