gitlab-ci: fix merge tree URL for gating pipelines

Michael Hofmannrequested to merge
mh21_rh/kernel-ark:fix-gating-merge-project-url into os-build

CI_MERGE_REQUEST_PROJECT_URL is not available when running gating pipelines for the kernel builder images. Change that to CI_PROJECT_URL which should be available everywhere.

Example for a failed pipeline this should fix: https://gitlab.com/redhat/red-hat-ci-tools/kernel/cki-internal-pipelines/cki-trusted-contributors/-/jobs/6236989232

Signed-off-by: Michael Hofmann mhofmann@redhat.com

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