Use (local) rhel7_build_image for Linux/s390x builds

[sxa]

Needs #611 merged first
Fixes adoptium/infrastructure#2731

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[sxa]

run tests

[eclipse-temurin-bot]

 PR TESTER RESULT 

✅ All pipelines passed! ✅

[karianna]

making draft to make sure I don't land before the precuror has landed.

[steelhead31]

LGTM

[andrew-m-leonard]

lgtm