Pre-build container image

[vstirbu]

Motivation

Currently, the container is build every time the action is run in the target repository. As a result the model card validation is slow due to inefficiencies in downloading dev dependencies and building.

We should use a pre-build image that contains only the production dependencies.

Solution

Spectral action provides a blue print from implementing the functionality.

Tasks

• build container
• include only prod dependencies
• handle versioning in action.yml (manual release process for now, but follow the GitHub's publish-action)