CI on GitHub Actions gets a better annotation experience. Leak test
scripts are stopped at their first failure with --immediate to
prevent flooding the log, and failures are correctly annotated with
their file and line number.
* hn/ci-leak-sanitizer-annotations:
ci: point test failures and fixed known breakages at their file and line
ci: annotate leaks and stop a leak-sanitizer script at its first failure
a0c87fc8b3