Bug: Notation panics on init when $HOME and $XDG_CONFIG_HOME unset

### What is not working as expected?

The bug relates to an issue raised in https://github.com/fluxcd/flux2/issues/4961

This gist of the issue is when $HOME or $XDC_CONFIG_HOME are unset, `dir/path` panics when initialising https://github.com/notaryproject/notation-go/blob/974c2916fa135b977b02db1714efb6ed2ecec0f3/dir/path.go#L82-L97

### What did you expect to happen?

I would expect notation to not panic, breaking any application importing the notation SDK when $HOME and $XDC_CONFIG_HOME are unset.

### How can we reproduce it?

Sets can be found in the reference issue 

### Describe your environment

OS: Arch Linux, Debian Bookworm
Golang: 1.22.5

### What is the version of your notation-go Library?

v1.1.0

	func init() {
	loadUserPath()
	}

	// loadUserPath function defines UserConfigDir and UserLibexecDir.
	func loadUserPath() {
	// set user config
	userDir, err := userConfigDir()
	if err != nil {
	panic(err)
	}
	UserConfigDir = filepath.Join(userDir, notation)

	// set user libexec
	UserLibexecDir = UserConfigDir
	}

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Bug: Notation panics on init when $HOME and $XDG_CONFIG_HOME unset #446

What is not working as expected?

What did you expect to happen?

How can we reproduce it?

Describe your environment

What is the version of your notation-go Library?

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Bug: Notation panics on init when $HOME and $XDG_CONFIG_HOME unset #446

Description

What is not working as expected?

What did you expect to happen?

How can we reproduce it?

Describe your environment

What is the version of your notation-go Library?

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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