Never rely on default Gitlab Docker image in gitlab-ci

Recently gitlab.cern.ch changed the default Docker image used by CI runners to Alma 9, which caused one of the test jobs in the Gaudi pipeline to always fail.

This MR fixes the Docker image in the few test jobs that were relying on the gitlab runner default.

changed milestone to %v37r0

assigned to @clemenci

approved this merge request

enabled an automatic merge when the pipeline for 5548f108 succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• bf5383ad - Never rely on default Gitlab Docker image in gitlab-ci

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added 1 commit

• 50223186 - Do not use git from CVMFS for check-sources

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approved this merge request

merged

mentioned in commit f2781c31