persist_to_workspace paths accepts list of string, not string

[wolverineks]

Orb version

v5.4.0

according to docs, persist_to_workspace paths accepts list of string
https://circleci.com/docs/2.0/configuration-reference/#persisttoworkspace

orb provides a string, in several places

also, something about the path can't be root of the workspace, not sure if thats what . is

vscode yml extension indicates the same

ive seen . path provided elsewhere, so maybe its actually valid?