feat: .env file is optional

cmd/hspguard/main.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"os"
 
 	"gitea.local/admin/hspguard/cmd/hspguard/api"
 	"gitea.local/admin/hspguard/internal/config"
@@ -16,9 +17,8 @@ import (
 
 func main() {
 	err := godotenv.Load()
-	if err != nil {
-		log.Fatalln("ERR: Failed to load environment variables:", err)
-		return
+	if err != nil && os.Getenv("ENV") != "production" {
+		log.Fatalln("WARNING: .env file not found. Skipping...")
 	}
 
 	var cfg config.AppConfig