It would be great if this action would also set the email and name. In order to do other git operations it is required. I am adding this to my actions to get around it:

steps:
  - uses: actions/checkout@v1
  - name: Setup git user
    run: |
        git config --global user.name "$(git --no-pager log --format=format:'%an' -n 1)"
        git config --global user.email "$(git --no-pager log --format=format:'%ae' -n 1)"

Unfortunately I don't have access to the user email. It seems like these can come from the account in a more clean way here, but I guess I could also create my own action. Since this is so new I am not sure what the best way forward is so thought I would post here.