Request to build and release images for s390x

[namrata-ibm]

Changes included in this PR:

1. Updated base image to eclipse-temurin:ubi9-minimal considering it supports multiple archs. Also centos 7 will reach its end of life down the line. Wanted to understand whether this change would have any major impact on existing users?
2. Added s390x to jdk 11 & 17 matrix as jdk 20 is not yet available for s390x.

Resolves #173

[namrata-ibm]

@jmesnil could you please share your thoughts?

[namrata-ibm]

Can anyone have a look?

[jmesnil]

@namrata-ibm sorry for the late reply

I've recently updated WildFly Docker image to produce a JDK21 variant on ubi9-minimal that supports s390x.

Could you update your PR to rebase and add the linux/s390x platform for this JDK version?

I'd prefere to postpone the switch from centos7 to ubi9-minimal after it's communicated to our community with the impeding end of line of CentOS 7.

However, I see no issue with respiring our latest WildFly 32 images to add s390x support to their JDK 21 variants.

[namrata-ibm]

@jmesnil Thank you for your comments, will work on changes and update PR.

[namrata-ibm]

@jmesnil I have updated PR with your suggestions. Could you please have a look?
Thank you very much for your support.

[jmesnil]

@namrata-ibm thanks!

[jmesnil]

@namrata-ibm I've released new image tags with support for s390x: quay.io/wildfly/wildfly:latest-jdk21

Could you please try them to make sure they run as expected? Thanks for you contribution!

[namrata-ibm]

Hi @jmesnil I have verified that latest/latest-jdk21 images work as expected on s390x.
Thank you very much for your support.