This commit upgrades Github Actions workers to ubuntu-22.04
As part of that change, we (currently) no longer need the backports
nor toolchain-r/test PPAs, because ubuntu-22.04 include
recent-enough version of QEMU and gcc
We often see PR's opened and then immediately closed because folks think
they did something bad, or don't know how to fix the situation. So lets
try to give them a few pointers.
Previously if a commit message contained any carriage returns it would
correctly fail the 'contains CRLF line breaks' test, but it would also
report 'Commit message lines are too long' and 'Commit title ends in a
period', even if neither is true.
tim-actions/commit-message-checker-with-regex@v0.3.1 only uses the
keys 'sha' and 'commit.message'. Passing more information than that
is unnecessary and can lead to CI failures like this one:
https://github.com/SerenityOS/serenity/runs/4029269017?check_suite_focus=true#step:4:7
Instead of trying to pass data between workflow steps, we can instead
just do it all at once (plus this gives us more control over
formatting, which has also been improved).
