Investigate anchore scan job not providing output

Background

We're seeing anchore scan jobs that will hang for an hour with no output and fail due to a runner timeout. We need to investigate this issue and come up with a plan to resolve it.

To start, we have three main ideas for what the issue could be related to:

1. The proc we're creating with Popen for the wait is printing something to stderr that we never see and the process just hangs
   • It might also be an issue with how we're reading each line from stdout instead of using communicate
2. Anchore is going into an errored state and never reporting back
3. Something with anchorecli's functionality is breaking with a recent update of anchore

Acceptance Criteria

• Anchore scan provides output if errored
• Anchore scan doesn't hang if error occurs

Definition of Done

• All Acceptance Criteria have been completed
• Solution is captured as code and/or documentation and merge requests have been submitted