I do it similarly and it only costs me my working time. I do some of these things outside my official working times for free, but that is because I like the topic and like to have a good deployment pipeline. But I doubt it is in any way more significant time investment than administration of Github.
In the end you need to write your deployments scripts yourself anyway, which takes the most time. Otherwise for installation, the most time consuming task is probably ssh key management of your users, if you don't have any fitting infrastructure.
I meant the CI agents, not AI agents. These are just runners that execute the stuff that needs to be done for deployment/testing or general CI. These rarely call AI agents because these tasks need to be deterministic. If so, you probably want to call a local model under your control running on your own compute power.
In the end you need to write your deployments scripts yourself anyway, which takes the most time. Otherwise for installation, the most time consuming task is probably ssh key management of your users, if you don't have any fitting infrastructure.