chore(cicd): remove CI pipeline external infra dependencies

[schoren]

This PR focuses on making our pipeline easier to use, a bit faster, and remove dependenies with external resources, mainly cloud kubernetes.

Previously, we deployed the code to a kubernetes instance and created a tunnel via port forwarding. This apprach has a few problems:

1. Different e2e test parts (web, server, cli) sometimes interfere with each other. Some test rely on an expected app state, and concurrent tests might modify that state. This means we cannot run different e2e in parallel
2. It's hard to reproduce CI results locally, because envs and states might be difficult to reproduce
3. We flood our docker hub repo with pr-* images. They need to be deployed somewhere to be accessible to the deployment.

With this new approach, each e2e test starts its own docker-compose instance. They run in parallel without ever interacting with each other.
The pipeline is defined to use bash scripts that live in the repo. This makes it easy to run the exact same tests with the exact same params on the CI environment and locally.

By leveraging docker export/import of images and GitHub Actions artifacts, we don't need to ever push the image to an external repo.

There's also some new documentation about how to run and test the app locally in CONTRIBUTING.md

Checklist

• tested locally
• added new dependencies
• updated the docs
• added a test

[danielbdias]

Even with waitForPort for some reason Pokeshop drops the connection for a while, this is why I added time.Sleep again.

[jorgeepc]

serving both the CLI and the web UI ?

[schoren]

it doesn't serve the CLI, it serves the API that the CLI consumes. but it's also the "http server" that delivers the web UI (like index.html, *.js, etc). That's what this means by "serve". Not that it is "at the service of", but that it delivers the web responses for.

Does that make sense? Do you think there's a more clear way to state that?

[jorgeepc]

I see. No, I think it's ok in that way. Thanks for the details.

[xoscar]

I love what we did here, as soon as we get v0.11.10 out the door lets merge this!