CentOS is EOL: remove and replace with redhat/ubi images

[q0rban]

As of docker-library/official-images#17094, there is now no official docker image for CentOS.

• Remove centos from our repo
• Check if any customers are using tugboatqa/centos and let them know it's going away
• Remove tugboatqa/centos from docker hub
• Remove documentation about centos from https://docs.tugboatqa.com/reference/tugboat-images/
• Add replacement

[rabbitlair]

According to official announcement, the only recommendation is to migrate to RHEL. I would remove CentOS entirely after some reasonable time - it is officially EOL, and this period of grace should not be too long.

[q0rban]

@rabbitlair they have already removed the centos official docker image that we are extending, so our builds are currently failing. So we do need to do something.

[rabbitlair]

@q0rban, noted! Thank you for the heads up about the image being removed.

I have create PR #148 to remove the Centos7 image. Also, we may consider adding the official rhel images from Dockerhub. Any thoughts?

[q0rban]

Perhaps https://hub.docker.com/r/redhat/ubi9?

[q0rban]

Ah, that's what you linked to as well. 👍

[rabbitlair]

Sounds good to me. I will add that one in a follow up pull request, so we can merge #148 as soon as possible to prevent our builds from erroring

[q0rban]

Updated the issue description with some tasks

[rabbitlair]

Thank you!

[rabbitlair]

According to these queries I run against our MongoDB server, no previews are using centos image:

tugboat> db.services.find({ image: /^centos/ }).count()
0
tugboat> db.services.find({ 'config.image': /^centos/ }).count()
0
tugboat> db.services.find({ image: /^tugboatqa\/centos/ }).count()
0
tugboat> db.services.find({ 'config.image': /^tugboatqa\/centos/ }).count()
0

[q0rban]

After checking, and some conversation, since no one is currently using a centos image, we don't feel the need to create a new rhel/ubi* image for tugboat. If someone requests one, we can add it at that point.

[rabbitlair]

PR with the changes to documentation: TugboatQA/docs#405