fix: capitalize and add config tags to env and loglevel fields

main.go

@@ -45,8 +45,8 @@ type DBConfig struct {
 }
 
 type Config struct {
-	env      string
-	loglevel string
+	Env      string `config:"env"`
+	Loglevel string `config:"loglevel"`
 	Server   struct {
 		Port int `config:"port"`
 	} `config:"server"`
@@ -67,7 +67,7 @@ func main() {
 	cfgErr := cfgReader.Read(&cfg)
 
 	zapcfg := zap.NewProductionConfig()
-	if cfg.env == "dev" {
+	if cfg.Env == "dev" {
 		zapcfg = zap.NewDevelopmentConfig()
 	}
 	logger, err := zapcfg.Build()