solved, just configure apache2 in the wordpress container, leave out nginx

copy your ssl certicate files to the docker

docker cp certfile.crt certfile.key wordpress:/etc/certs

login the container

a2enmod ssl
a2ensite default-ssl.conf

edit /etc/apache2/sites-available/default-ssl.conf

SSLCertificateFile /etc/cert/certfile.crt
SSLCertificateKeyFile /etc/cert/certfile.key

restart apache

service apache2 restart