Guide: How to order from `Onboarding API` via GitHub Action

[GenosseOtt]

Description

People use our Onboarding API - primarily using plain kubectl.
As we believe in automation, support for GitHub Actions is a must.

Technical Steps

• manually click together

This task does not involve actual implementation (todays assumption!)

Acceptance criteria

• End user guide describing how user can use use service from GitHub
• If manual "Trust" configs are necessary - lets offer via Service ticket

[reshnm]

Currently I would set this up manually for users that are requesting this functionality.
We should test this use case ourselves and then write an operations guide on how to do this.

In the future we can think about implementing an automated approach.