Install can be done on same server as servicedesk app, and is almost the same as servicedesk install

Just follow this guide:

https://confluence.atlassian.com/adminjiraserver072/installing-jira-applications-on-linux-828787555.html

For DB:

https://confluence.atlassian.com/adminjiraserver072/connecting-jira-applications-to-mysql-828787562.html

For reverse proxy + docker setup see:

Installing Confluence server in Docker behind reverse proxy

Confluence troubleshooting