plonecli add-on should be buildout compatible

[gyst]

❯❯ plonecli -V
Available packages:

    plonecli : 3.0

    bobtemplates.plone: 8.0.0

❯❯ plonecli create addon collective.lockdownclassicui

This results in:
https://github.com/collective/collective.lockdownclassicui/commit/6f4a680dbe80a898ff18a595ae443b422d1ea7e2

Adding this to a pre-existing buildout fails.

The required fix to get the package to work is:
https://github.com/collective/collective.lockdownclassicui/commit/593a64e77b36660aeef1aec4804347a51f9064e5

[gyst]

Even with that fix, the tests are not discovered and run by the zope testrunner...