[crac] RFR: 8357645: [CRaC] Use Alpine-based images when executing tests on musl

[Timofei Pushkin]

Makes CRaC tests which use containers use Alpine-based images when run on a musl-based system.

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

Commit messages:
 - Use alpine-based images when executing on musl

Changes: https://git.openjdk.org/crac/pull/230/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=230&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357645
  Stats: 19 lines in 4 files changed: 14 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/crac/pull/230.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/230/head:pull/230

PR: https://git.openjdk.org/crac/pull/230