I just made a reply on this thread.... Source control in Ignition 8 - #11 by ryanjmclaughlin
Yes, we just setup Devops release pipelines to perform project deployments. Ignition projects are simply file resources, so all that is needed is a copy files task to move the project files to the target gateway.
Others might chime in more, but I work with developers from both an IT background and an Operational/Engineering background. I always feel that Ignition is an operational tool, not an IT tool. When you focus too strong on testing "code" then you try to write everything in Ignition is scripts which is just the wrong approach. Most users I work with that avoid coding everything in Ignition are more successful. A lot of parts of Ignition are configuration over code so standard unit testing and such is not really possible, I'm sure it could happen, but not sure if its worth the effort.