Integrate CI test runs for all PRs as a check

[adamfowleruk]

Please start with a use case description for a USER of this enhancement

[Who] As a Herald Developer

[What] I need to ensure my PR is validated against existing tests before it is merged

[Value] In order to prevent regressions

Describe the potential solution you'd like

PR bot check for running automated tests

Describe alternatives you've considered

Manual (what we are doing today) - open to regressions, and generally only test the 'latest' target release.

Additional context

Start with a 'latest' test run for now, then move to multiple (all) supported OS versions later.

Relative priority

HIGH required for v2.0 release. (LFPH CI best practice)

[adamfowleruk]

Fixed in latest. Incorrectly named feature branch feature-152 so it tagged #152 by mistake.