I don't have much to add but wanted to note that the problem appears to be in rendering grengor's documentation. The package itself may be installed fine, just not its associated documentation. You can test to verify if package is installed by querying via raco pkg or just requiring gregor in a test file and running it.
Depending on your needs, it may not be a big deal if your Docker doesn't have the package documentation available. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.