As a follow-up for #51 (closed) we should document the manual steps required for building new Tart images.
While our goal is to build that from CI/CD (#50 (closed)) this is still not ready. And even when done, we may be hit a case when we will need to do that manually.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information
I've marked this issue as blocked by the job image automation because the remaining or possible manual steps will not be known until that automation is done. Currently all the steps are manual, but we plan to immediately begin restoring automation to the build process. So once we have some automation in place, we can document how to do each of the steps manually.
As a stand-in (in the event we need to build images sooner) the steps I used in this issue: #51 (comment 1357513740) can be followed reasonably well.