Fix 12955 / Set default value of postgresql.postgresServer to 127.0.0.1 in helm chart

[lchastel]

Description

Fix #12955
Set default value of postgresql.postgresServer to 127.0.0.1 so helm install won't failed if it's not defined.
Move the comment on postgresServer at the beginning of postgresql item, to ease the usage of external instance.

Test results

helm template . --values myvalues.yaml --show-only templates/configmap.yaml

---
# Source: defectdojo/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: defectdojo
  labels:
    app.kubernetes.io/name: defectdojo
    app.kubernetes.io/instance: defectdojo
    app.kubernetes.io/managed-by: Helm
    helm.sh/chart: defectdojo-1.6.203-dev
data:
.... 
  DD_DATABASE_HOST: 127.0.0.1
.... 

Documentation

N/A

Checklist

This checklist is for your information.

• Make sure to rebase your PR against the very latest dev.
• Features/Changes should be submitted against the dev.
• Bugfixes should be submitted against the bugfix branch.
• Give a meaningful name to your PR, as it may end up being used in the release notes.
• Your code is flake8 compliant.
• Your code is python 3.11 compliant.
• If this is a new feature and not a bug fix, you've included the proper documentation in the docs at https://github.com/DefectDojo/django-DefectDojo/tree/dev/docs as part of this PR.
• Model changes must include the necessary migrations in the dojo/db_migrations folder.
• Add applicable tests to the unit tests.
• Add the proper label to categorize your PR.

[dryrunsecurity]

No vulnerability summary was generated for this pull request.

---

All finding details can be found in the DryRun Security Dashboard.

[mtesauro]

Approved