Add debug functionality to a runner worker pod on Kubernetes

Problem(s) to solve:

1. When troubleshooting we need the pod to be available even after the job is completed to go to shell and check the files.

2. Customer needs a suitable way to inspect CI runner job pods in the event that a job fails. They are migrating to GitLab from Jenkins (where they have more control over the runner lifecycle) and are looking for an equivalent mechanism.

Requirements for solution:

Devops engineering should have a setting in gitlab ci to set the pod availability after the job is complete so that we can check the logs.

Brainstorm

• Can we leverage the prestop-k8s-lifecycle-hook as a starting point for solving this problem?

Implementation proposal (engineering)

• {placeholder for implementation proposal details.}