Added a "-conf_dir" option to customize *.toml configuration file directory.

fix https://github.com/chrislusf/seaweedfs/issues/2753

weed/weed.go

@@ -4,6 +4,7 @@ import (
 	"embed"
 	"fmt"
 	weed_server "github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	flag "github.com/chrislusf/seaweedfs/weed/util/fla9"
 	"io"
 	"io/fs"
@@ -40,6 +41,8 @@ var static embed.FS
 
 func init() {
 	weed_server.StaticFS, _ = fs.Sub(static, "static")
+
+	flag.Var(&util.ConfigurationFileDirectory, "conf_dir", "directory with toml configuration files")
 }
 
 func main() {