git: openjdk/jdk17u-dev: 8342988: GHA: Build JTReg in single step

[Goetz Lindenmaier]

Changeset: 087e8a29
Branch: master
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2025-02-11 13:51:28 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/087e8a29f2aead8b31a71b144523810c8538388c

8342988: GHA: Build JTReg in single step

Reviewed-by: sgehwolf, mbaesken
Backport-of: 6e6f8b2f90e362ceb2d76e791cd6e58cf5d3ddbd

+ .github/actions/build-jtreg/action.yml
! .github/actions/get-jtreg/action.yml
! .github/workflows/main.yml