Better handing of the PR builds.
With this release you can handle PR fork builds even better.
The PR builds are now better handled with regards to both
running (using merge-request) and canceling (with cancel notifications).
First of all the merged commit from the PR are exposed, not the original commit
from the PR.
Secondly - the workflow run can notify the original run via comment, that
the workflow run has started and it can post link to the workflow_run in the original
PR.
Thirdly - when canceling duplicate PRs or PRs with failed
jobs, the workflow might add a comment to the PR stating the
reason why the PR is being cancelled.