Fix installing brew-build on rhel-7 ppc64 arch

Jakub Skundarequested to merge
install-brew-build-on-ppc64 into main

RHEL 7 ppc64 was excluded from brewkoji installation because no RCMTOOLS compose exists for ppc64. Work around this by using the RCMTOOLS x86_64 repo which contains the noarch brewkoji package.

The arch-specific libcomps and python2-libcomps dependencies are not available in the x86_64 repo, so they are installed directly from Brew as ppc64 RPMs before brewkoji.

The x86_64 RCM repository is removed after installation to prevent arch mismatch issues during later package operations on the guest.

Resolves: TFT-5022 TFT-4976

Edited by Miroslav Vadkerti

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