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

tools/asynqmon/cmd/ls.go

@@ -17,6 +17,7 @@ import (
 	"github.com/hibiken/asynq/internal/rdb"
 	"github.com/rs/xid"
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )
 
 var lsValidArgs = []string{"enqueued", "inprogress", "scheduled", "retry", "dead"}
@@ -58,8 +59,9 @@ func init() {
 
 func ls(cmd *cobra.Command, args []string) {
 	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)
 	parts := strings.Split(args[0], ":")