[Feature]: Adding XmlStarlet to cli tools.

[userwiths]

What is your idea or feature suggestion?

Addition of the xmlstarlet cli tool to the PHP container.

Benefits

While the jq/xq tool set allows querying of xml & json. xmlstarlet tops that with easier to use function to edit/manipulate those structures. Man pages outline the functions which are provided. Together with selection there are also utilities to allow edit, validate, transform, format etc. an xml structure, which are either missing in xq or requiring a workaround to reproduce.

Where can we find information about this?

SourceForge Can't quite verify the authenticity but there seems to be a github repo too Github I'd trust the SourceForge one if i had to choose.

Are you willing to provide a PR to address this?

None