[crac] RFR: Add CRaC-specific tests to GHA

[Radim Vansa]

Existing GitHub Actions run test tier1 but since most changes in this project focus on the CRaC capabilities we should run them in an automated fashion, too.
Right now the tests are mostly failing: this should be addressed in https://github.com/openjdk/crac/pull/47

-------------

Commit messages:
 - Add CRaC-specific tests to GHA

Changes: https://git.openjdk.org/crac/pull/48/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=48&range=00
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/48.diff
  Fetch: git fetch https://git.openjdk.org/crac pull/48/head:pull/48

PR: https://git.openjdk.org/crac/pull/48