authentik testing setups

Kubernetes manifests to quickly test different cluster setups with authentik.

Run

make all:

Apply common resources, in the following order:

• FluxCD: used to deploy helmcharts via CRDs
• authentik: Install authentik with PostgreSQL and Redis
• whoami: A simple application to test with

make nginx:

Common resources + nginx ingress controller

make traefik:

Common resources + traefik ingress controller

make remove:

Remove all resources.