If you have a FQDN and a certificate you want to use, place the certificate and the key in the configuration_files/ssl_certificates folder before running the playbook. Also, replace the fqdn_alfresco: "your_domain.com" with your own domain in group_vars/all.yml along with setting use_ssl: true.
Note: The certificate and the key should be named the same as the
domain, for example, your_domain.com.key and
your_domain.com.crt