Metrics on GHA - spike

[macfarla]

investigate what metrics we can get trends etc from GHA runs - build times, flaky tests

there are some tools that may be useful

GHA dashboards: https://octolense.com/ or https://gitboard.io/dashboard for our GHA builds similiar to CircleCI insights - might be worth installing on besu?

https://github.com/Labbs/github-actions-exporter