workflow: Updated workflow comment for all

The previous version failed, because it looked for the check from the
branch in the fork, but looked for it in the main repo. Now uses the sha
to get the commit on which checks were run.

Previous description

This works by uploading the data from the main workflow with low
permissions as an artifact, then downloading the data in a workflow with
higher permissions to post the comment.

Third party actions are fixed at a commit, in case they get compromised.

Also set the build-firmware VM to ubuntu-22.04, which was missed when
updating workflow deps earlier.

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