In the past, it seemed that we had to add a trailing slash (/) after the
OpenShift Registry URI. Now, at least on the CI machine matix, this
makes it fail:

    INFO: oc whoami -t | docker login -u oaicicd --password-stdin default-route-openshift-image-registry.apps.oai.cs.eurecom.fr/
    INFO: docker pull default-route-openshift-image-registry.apps.oai.cs.eurecom.fr/oaicicd-ran/oai-gnb:develop-46a1d2a6
    WARNING: command "docker pull default-route-openshift-image-registry.apps.oai.cs.eurecom.fr/oaicicd-ran/oai-gnb:develop-46a1d2a6" returned non-zero returncode 1: output:
    Error response from daemon: Head "https://default-route-openshift-image-registry.apps.oai.cs.eurecom.fr/v2/oaicicd-ran/oai-gnb/manifests/develop-46a1d2a6": unauthorized: authentication required

Remove the trailing slash makes it work, like so:

    INFO: oc whoami -t | docker login -u oaicicd --password-stdin default-route-openshift-image-registry.apps.oai.cs.eurecom.fr
    INFO: docker pull default-route-openshift-image-registry.apps.oai.cs.eurecom.fr/oaicicd-ran/oai-gnb:develop-46a1d2a6

The docker pull succeeds.