Add a step to https://github.com/wildfly/wildfly/blob/main/.github/workflows/shared-wildfly-build.yml to have it call 'git log' at the end, with suitable params to limit the logging to a handful of recent items

This kind of data is useful when trying to understand what commits are in a job execution, e.g. when this job is part of a larger job, like running a TCK. What was built can be determined by looking at the actions/checkout output, which logs the sha of the checkout, but it's more user-friendly to be able to just read the commit messages.