document how to diagonose and fix`install retries exhausted`

[kvaps]

example:

# kubectl get hr -A -n cozy-dashboard dashboard
NAMESPACE                        NAME                        AGE   READY   STATUS
cozy-dashboard                   dashboard                   15m   False   install retries exhausted

kubectl describe hr -n cozy-dashboard dashboard

if Events: <none> then:

kubectl patch hr -n cozy-dashboard dashboard -p '{"spec": {"suspend": true}}' --type=merge
kubectl patch hr -n cozy-dashboard dashboard -p '{"spec": {"suspend": null}}' --type=merge

and again

kubectl describe hr -n cozy-dashboard dashboard