[1.5.z] Backport Fix the Keycloak memory issue on Podman setting JAVA_OPTS_APPEND

[jcarranzan]

Summary

This is a backport contains:
#1389

Please check the relevant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Dependency update
• Refactoring
• Backport
• Release (follows conventions described in the RELEASE.md)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• This change requires execution against OCP (use run tests phrase in comment)

Checklist:

• Example scenarios has been updated / added
• Methods and classes used in PR scenarios are meaningful
• Commits are well encapsulated and follow the best practices

[fedinskiy]

Thank you, but please, wait for CI to finish

[fedinskiy]

run tests

[jcarranzan]

Openshift errors are not related to this MR

[jedla97]

@jcarranzan don't forget remove the backport label on the original PR, also for future the commit should contains (cherry picked from commit X) by adding -x to cherry pick command.