Pass the registry_id back to the api for loading tags.
[delivers #80462910]
Increasing coverage for template_repo_controller
Adding new type icon assets
Create a new registry [finishes #80142256]
Delete registry [finishes #80142088]
Don't hardcode FakePanamaxApi webmock setup.

It's an edge case, but if you run the specs inside of a Docker container that
has the environment PMX_API_* variables set, they override what is in .env and
cause the tests to request something other than localhost.
Ability to enable/disable a private registry.

[delivers #80141970]

Signed-off-by: Don Petersen <don@donpetersen.net>