Based on the latest walk-through: https://github.com/github/codeql-action.
Gets rid of the warning:
Warning: 1 issue was detected with this workflow: git checkout HEAD^2 is no longer necessary. Please remove this step as Code Scanning recommends analyzing the merge commit for best results.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Try to make it clear that sloppy, throw it over the fence, patches
won't be accepted without revision and try to make sure a potential
contributor sees the warning while creating a pull request.
