[crac] RFR: Add CRaC-specific tests to GHA [v7]

[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

Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:

  Let ReseedTest use stdout rather than exit codes
  
  There was a 1:256 chance of test randomly failing because the random
  generators produced the same number, despite differently seeded.

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Changes:
  - all: https://git.openjdk.org/crac/pull/48/files
  - new: https://git.openjdk.org/crac/pull/48/files/e9b8f717..704f50a4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=48&range=06
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=48&range=05-06

  Stats: 5 lines in 1 file changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/crac/pull/48.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/48/head:pull/48

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