I have long been a fan of Synology NAS's for this type of thing (I have been using one since 2007). They offer CPUs these days that should be beefy enough for a

I have long been a fan of Synology NAS's for this type of thing (I have been using one since 2007). They offer CPUs these days that should be beefy enough for a CI use case, unless you have a very large project. QNAP offers similar products as well. I bought one as I just wanted a low power always-on server that Just Worked with a software ecosystem around it. You can now run docker containers on them as well easily. I can access at home or via the web- they provide a dyndns service so I can just go to http://quickconnect.to/$username http://quickconnect.to/$username and access from anywhere.