There is now an official release version (or two) of the image-id tool!
This release is the final result of both porting image-id to use the latest 2.0 API version of libmirage, and adding support for reading MCN and ISRC numbers from disc images. There is some work in progress that might allow these to be automatically submitted to musicbrainz using a future third-party tool.
The release notes and download files are available on the Github release page.
Note that 1.0.1 is a sort of brown-paper-bag release; I’d forgotten to pull before tagging. There is no reason for you to use 1.0.0; please go with 1.0.1 instead.