Mirror oidc-authservice to avoid losing source code for the abandoned tool

[ca-scribner]

Context

https://github.com/arrikto/oidc-authservice is no longer maintained and could be removed at some point. We build our own image for this repo, but do not have a copy of the source code in case this repo was removed. We should fork the source and build from that

Kinda related to kubeflow/manifests#2469

What needs to get done

1. fork https://github.com/arrikto/oidc-authservice to Canonical org
2. refactor the rock in this repo to build from Canonical's source

Definition of Done

1. rock in this repo builds from Canonical source

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5234.

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