aks: ensure there is a static ip assigned to the cluster
It allows to keep the same ip if all the ingress are removed
Related to T4046
For the fun this diff is already pushed on the staging gitlab instance https://gitlab-staging.swh.network/swh-sysadm/swh-sysadmin-provisioning/-/commit/c7097d2af5997063c1110405c1af0a27a961a845
Test Plan
terraform apply
- Deploy, undeploy and deploy a gitlab
- The public ip must not have changed between the 2 deployments
Migrated from D7488 (view on Phabricator)