Simple platform tests

[pedro-gutierrez]

Is your feature request related to a problem? Please describe.

At the moment, we don't have any monitoring in place to detect when the toolbox is down.

Describe the solution you'd like

A simple platform test, with the following features:

• It is totally external to the toolbox (runs outside Okteto)
• It runs periodically (eg. every hour)
• It is able to run a simple, non authenticated GraphQL query, eg: query { countGroups }
• Handles connection or server errors and notifies via slack to #dev-toolbox-ops

This could be easily implemented as a new GitHub workflow in this repo, with a cron like schedule, and a custom bash based GitHub action.