Registry lectures don't work past 2.7

[BretFisher]

I use PWD training to walk students through installing a local registry and then doing the same with a self-signed cert. Something's changed since 2.7 release, so I need to debug and update existing lectures.

Student says:

Still not corrected and in play with docker it is also wrong. this works:
docker run --entrypoint htpasswd registry:2.7.0 -Bbn moby gordon > auth/htpasswd

Future improvement: Don't bother with TLS in this simple registry deployment, but rather move from simple local registry HTTP to a Harbor section.

• Add written lecture to workaround degraded lecture Assignment: Secure Docker Registry With TLS and Authentication
  
• Update PWD tutorials Part 1 and Part 2
• Replace degraded assignment after PWD is updated.
• Add a new section on https://goharbor.io/

For reference

PWD Registry for Linux Part 1, Part 2 & 3

Docker's reg docs

Origional Q&A

Q&A suggesting hints until I get this fixed