Added env var for image prefix to engine registry

[sololegends]

Changes

Added environmen variable CODECLIMATE_PREFIX as an option for the codeclimate analyzer image prefix.

This will allow offline code quality scanning something huge for many orginazations

Impact

These changes won't impact any existing configurations. Anyone wanting to use this feature can , but no one will have to alter their environments to use a new image.

Testing

• Tested pointing to a local docker registry (GOOD)
• Tested swapping the codeclimate image in an environment already using codeclimate:0.85.8 (GOOD)
  • No changes required for functionality
• Tested swapping the codeclimate image in an environment already using codeclimate:0.85.9 (GOOD)
  • No changes required for functionality

[CLAassistant]

All committers have signed the CLA.

[goldenson]

👋 @filipesperandio should we merge this MR as it has been approved?

[filipesperandio]

My bad.
Got distracted and forgot to come back here.

[HSKC]

Thanks man. You saved my day. Someone should add this to the documentation.

[trulyliu]

Any usage example?

[sololegends]

Any usage example?

I use it in my gitlab CI scripts, https://gitlab.sololegends.com/gitlab/offline-gitlab

Also, I've implemented this in the gitlab code quality scanner: https://gitlab.com/gitlab-org/ci-cd/codequality/-/blob/master/run.sh

Otherwise, just add the env variable "CODECLIMATE_PREFIX" to the docker run command.
I. E.
docker run -env CODECLIMATE_PREFIX=repo.example.com --volume "$SOURCE_CODE":/code codeclimate/codeclimate analyze