Research the isolation framework

[riccardomc]

Since we are going to run multiple applications owned by different people on a single cluster, we need a solid Isolation Framework to avoid as much as possible interference among applications.

This interference can be malicious or non-malicious. In the first case we need a solid security framework and in the second a proper way of limiting and isolating and limiting resource usage.

This topic is very large, but an (incomplete) list of subtopics interesting to explore could be the following:

• Namespace operator
• PodSecurityPolicies
• Network Policies
• Firekube

This issue is related to coming up with a solid, initial, viable idea and implementation for the isolation framework that will make our free tier safe to run.

We are not going to focus on this issue for the PoC. Additionally, we are not going to offer any guarantee of isolation in the Free Tier as well (because it's free...), but we must at least have an idea and an initial implementation by then.