Fix make test

[kurtmckee]

Description:

make test references an undefined variable, APP_PORT, which causes the the docker-compose command's -p argument to be malformed:

docker-compose run -p  :8080 ...
                      ^--- missing the left-side port!

PR Checklist:

• Code is formatted and linted (run pre-commit run --all-files)
• Tests pass (run make test)
  The test failure in CI appears to be unrelated to this change.
• Documentation has been updated to reflect changes, if applicable
• Changes are added to the changelog

[jonhealy1]

Thanks