[ci skip] Allow config file to set default values for flags

tools/asynqmon/cmd/history.go

@@ -14,6 +14,7 @@ import (
 	"github.com/go-redis/redis/v7"
 	"github.com/hibiken/asynq/internal/rdb"
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )
 
 // historyCmd represents the history command
@@ -55,8 +56,9 @@ Usage: asynqmon history [num of days]
 
 	}
 	c := redis.NewClient(&redis.Options{
-		Addr: uri,
-		DB:   db,
+		Addr:     viper.GetString("uri"),
+		DB:       viper.GetInt("db"),
+		Password: viper.GetString("password"),
 	})
 	r := rdb.NewRDB(c)