Pilot demo instructions

[gbartolini]

Once the image is available, write instructions on how to demo the module with Postgres and Keycloak via CNPG.

[gbartolini]

I have been playing with this example:

apiVersion: postgresql.cnpg.io/v1
kind: Cluster
metadata:
  name: angus
spec:
  instances: 1

  storage:
    size: 1Gi

  imageName: ghcr.io/cloudnative-pg/postgresql:18-minimal-trixie

  postgresql:
    extensions:
    - name: kc-validator
      image:
        reference: ghcr.io/cloudnative-pg/postgres-keycloak-oauth-validator-testing:dev