Add support for symlink in package command (#120)

* Add support for symbolic links in package command

* Refactor symlink handling in package command

* Improve comment clarity for symlink handling in package command

---------

Co-authored-by: 王智勇 <tomwang@yunify.com>

Author: knktc

cmd/package.go

@@ -47,7 +47,13 @@ func (o *packageOptions) packageCmd(_ *cobra.Command, args []string) error {
 	}
 	defer os.RemoveAll(tempDir) // nolint
 
-	if err = copy.Copy(p, tempDir); err != nil {
+	// Configure copy to follow symlinks and copy their target content
+	opt := copy.Options{
+		OnSymlink: func(_ string) copy.SymlinkAction {
+			return copy.Deep
+		},
+	}
+	if err = copy.Copy(p, tempDir, opt); err != nil {
 		return err
 	}