.github/workflows/lint.yml: ansible-lint needs collection source dir

ansible-lint required to be run in a collection source directory with
correct and working galaxy.yml

As ansible-freeipa is not converted to a collection, the galaxy.yml file
can not be used to create the collection. This needs to be done with
utils/build-galaxy-release.sh. The script is fixing all the prefixes for
the roles and modules in all the yml files and also example snippets and
in the documentation.

Therefore utils/build-galaxy-release.sh is called with the "-k" option
to keep the directory that has been used to generate the collection with
the script. Afterwards ansible-lint is run in this build directory.