This package is being added to RHEL 8.6 at the next minor release. Please remove it from epel after the next RHEL minor release.

*** This bug has been marked as a duplicate of bug 2072386 ***

(In reply to RHEL Process Automation from comment #1)
> This package is being added to RHEL 8.6 at the next minor release. Please
> remove it from epel after the next RHEL minor release.

In what minor release of RHEL 8.6 is xmlstarlet being added?
I do not see the xmlstarlet package in the latest UBI 8 container images, nor in the ubi-8-baseos or appstream repos.
https://catalog.redhat.com/software/containers/ubi8/ubi/5c359854d70cc534b3a3784e?container-tabs=packages

xmlstarlet was added to RHEL 8.6 in this errata.

https://access.redhat.com/errata/RHBA-2022:7118

I also do not see xmlstarlet in UBI 8, but that is not surprising because UBI is a subset of RHEL content.  If you'd like to request it be added to the UBI content set, see question 35 in the FAQ.

https://developers.redhat.com/articles/ubi-faq#support__lifecycle__and_updating