Version control in activity code or worker #8316
Description
How can we control each individual code components to be frozen to a fixed version, or at least be notified about its environments and code hashes, saving a copy so that we can roll back to a certain version? I know it might take extra care such as using a local docker registry, or a version control system, or a local software package publishing system. But how does Temporal know the version of the code which it is running? Do we have an API to annotate this in a custom way, and possibly orchestrate rollback operation?