This action outputs the git message associated with the current SHA

Optional The sha of the commit to get the message for. Defaults to the GITHUB_SHA environment variable set by Github.

The git-message

The title of the git-message, i.e. the first line

The body of the git-message, i.e. everything but the first line

Without SHA:

uses: kceb/git-message-action@v2

With specified SHA:

uses: kceb/git-message-action@v2
with:
  sha: '2905893ab6e5f2644201c2abc04e3d83bf317d9b'

For more info on how to use outputs: https://help.github.com/en/actions/reference/contexts-and-expression-syntax-for-github-actions#steps-context