RHEL7 containers can no longer update on build-marist-rhel8-s390x-1

[sxa]

This is preventing regeneration of the docker images:

This system is not receiving updates. You can use subscription-manager on the host to register and assign subscriptions.

Ref: https://ci.adoptium.net/job/rhel7_docker_image_updater/label=build-marist-rhel8-s390x-1/32/console

It is likely that this is a side effect of RHEL7 on s390x going out of support earlier this year.

Related adoptium/temurin-build#3847

[sxa]

I've re-enabled the JDK10_BOOT_DIR definition on build-marist-rhel8-s390x-1 for now (set to /usr/lib/jvm/jdk-10) because this image cannot currently be updated.

Ref: #2912

(Will probably do the other variables too - the same problem may well appear for other boot JDK versions)

[sxa]

This may have been due to the ROSI subscription which we use for RHEL expiring. This has now been renewed so we need to validate the registration on the host system and then retry this (plus ensure we still have access to the rpms required for producing the devkit!)