Extend gitlab-runner helper to enable sending artifact metadata to a metadata data store

Overview

A customer has built a Grafeas internal extension for GitLab Runners with Grafeas/Kritis. The customer's initial request was to integrate GitLab Runner with this solution.

Proposal

Extend gitlab-runner helper to support hooks before and after each stage/task.

This would be a generic solution to the problem of extending Runner without modification to its source code. In the context of a metadata store, this would allow a process to verify and fingerprint artifacts, and upload data to an external data source.

Hook scripts/programs could be installed to a known location and available to the Helper process/image. For Docker/Kubernetes, this would mean users of the function would need to extend our helper images.

Each hook would receive context relative to the stage (for example, a list of files to be extracted or archived).

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