Non parallel multiarch

Possibly more successful multiarch pipeline run with max-parallelism=1 - https://gitlab.developers.cam.ac.uk/uis/devops/infra/dockerimages/-/jobs/2226216

Part of https://gitlab.developers.cam.ac.uk/uis/devops/iam/admin/-/issues/incident/156

assigned to @rjg21

added 1 commit

• 615c9ab7 - test: limit pipeline

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Hmm, well a Segmentation fault (core dumped) in the middle of arm64 dlib cmake (twice) may be a different error...