Generally things to be done with ``caddy-frontend``:
* tests: add assertion with results of promises in etc/promise for each partition
* generated files: ``| trim`` values (like ``slave_password[slave]`` in ``templates/template-log-access.conf.in``) in generated configuration files to have them renfered correctly
* ``apache-ca-certificate`` shall be merged with ``apache-certificate``
* ``apache-ca-certificate`` shall be appended to ``apache-certificate`` if not already there
