Create proposal how to automate testing Hub manifests

[pkosiec]

Description

Write proposal about our approach for automated Hub manifests testing.

• We want to test all Implementations inside a given GitHub repository
• In an automated way
• As GitHub Actions pipeline (but to verify whether we don't need to run such tests on external cluster, because of resource limits for GH Actions Runner)
• Should we support testing day-two operations?
• Cleanup: currently external cluster delete?
• Answer the question: Do we need to write some small testing framework? Or can we use something existing from OS community?
• Result: a document on capactio/capact repository summarizing the possibilities with a short comparison
• Nice to have: Prepare PoC to showcase the preferred idea

Reason

Currently, to test the manifests inside the hub-manifests repository, we need to manually run Actions. Our end goal is to have it automated, so that all Implementations are executed to check whether they work properly.

Use cases

• As a System Administrator, I want to make sure that the connected Public Hub contains valid, runnable manifests.
• As Capact Developer, I want to make sure any contribution to the hub-manifests repository is automatically validated on CI without a need to run Actions manually.

Additional links

• https://terratest.gruntwork.io/ - maybe it will be helpful for testing Terraform manifests