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Ability to add extra containers

Samuel Bagattin requested to merge samuelbagattin/gitlab-runner:feature/extra-containers into main

What does this MR do?

Adds the ability to have additional containers in the gitlab runner pod

Why was this MR needed?

We want to use docker+machine executor in Amazon EKS, but it does not support IRSA. One solution is to have a sidecar container with a simple script that gets credentials using assume-role-with-web-identity and updates ~/.aws/credentials on a recurring basis (this file would be shared between the 2 containers)

What's the best way to test this MR?

For example, add in you values file :

extraContainers:
- name: my-sidecar
  image: my-image
  imagePullPolicy: IfNotPresent
  command: ["my-command"]
  args: ["my-arg"]

Run Helm template, and verify that the container "my-sidecar" is present

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