fix: harden codebase - #12

Unexpected input(s) 'key', valid inputs are ['header', 'append', 'recreate', 'delete', 'only_create', 'only_update', 'hide_details', 'hide', 'hide_and_recreate', 'hide_classify', 'message', 'path', 'ignore_empty', 'skip_unchanged', 'follow_symbolic_links', 'number', 'number_force', 'owner', 'repo', 'GITHUB_TOKEN']