build command is wrong
The build command indicated for both singularity and docker are bad. Indeed, for example, when you run "build command" for a singularity recipe, it lacks the definition filename.
For docker, you need a "-f" flag to indicate the file as it can be another name than "Dockerfile" (maybe a "-t" flag to insert a label would be nice also).
Rémy.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information