deploy to github pages report no deploy_key

[zhjwpku]

Following are the deploy config:

deploy:
  provider: pages
  strategy: git
  edge: true
  cleanup: false
  github-token: $GITHUB_TOKEN
  local-dir: book # In case of custom book path: path/to/mybook/book
  keep-history: false
  on:
    branch: master
  target_branch: gh-pages

dist xenial and bionic both report the following error: