action

type Ref struct {
	Owner   string // "actions"
	Repo    string // "cache"
	Subpath string // "save" for actions/cache/save@v3 (no leading slash, empty if none)
	Ref     string // raw ref as written (branch/tag/SHA)
	IsSHA   bool   // 40-char hex
	// Comment fields are only populated when the source line had `# ...`.
	SrcRef      string // first whitespace-delimited token after `#`
	CommentTail string // remainder of comment after SrcRef (preserved as-is incl. leading space)
}