missing error handling in pkg/configutil/once.go #525
Description
What is the areas you experience the issue in?
Notation CLI
What is not working as expected?
If config files have permission error, it will trigger a program crash.
What did you expect to happen?
return the detail error rather than crash.
How can we reproduce it?
Remove the read permission for ~/.config/notaiton/config.json or ~/.config/notation/signingkeys.json.
Describe your environment
Linux, amd64
What is the version of your Notation CLI or Notation Library?
Notation RC.1