Add namespace explicitly

[CiraciNicolo]

Summary of changes:

The rationale behind this PR is that there are cases where it becomes quite complicated to deploy the application unless the namespace is explicitly provided — for example, when managing the application using a GitOps approach.

Checklist:

• I updated the artifacthub.io/changes annotation in Chart.yml according to the documentation
• Optional: I updated in README.md the Helm Values

[jdetroyes]

Hello @CiraciNicolo

Thanks for your contribution, one thing before merging, why did you add a separator in each .yaml files?

[CiraciNicolo]

Hi @jdetroyes, by specs a YAML file should start with "---"; it can be optional tho if no more than a document is present. It's just a preferred way. If you prefer, I can remove it.