Look into Angel's repository as an example to install JAR version of module.
Current release onlyoffice module is AMP. You can download it's last version from https://github.com/ONLYOFFICE/onlyoffice-alfresco/releases
The instruction how to install AMP modules is here: https://docs.alfresco.com/content-services/7.0/install/containers/customize/ The Onlyoffoce modume have AMP for Alfresco repository image and AMP for Share image. So, you must create two Dockerfile and build two custom images: for alfresco and for share.
If installation made with alfresco-docker-installer, just copy module amp files into alfresco/modules/amps and share/modules/amps, build images and recreate containers.
