Dear maintainers,

Feature Request

Is your feature request related to a problem or unsupported use case? Please describe.
Currently the helm chart only allows extraVolumes of types like configMap or emptyDir. I would like to be able to also mount secrets into the containers.

Describe the solution you'd like
Add another if-case allowing to mount Secrets e.g. here:

• https://github.com/suitenumerique/docs/blob/main/src/helm/impress/templates/backend_deployment.yaml#L133
• https://github.com/suitenumerique/docs/blob/main/src/helm/impress/templates/frontend_deployment.yaml#L123
• https://github.com/suitenumerique/docs/blob/main/src/helm/impress/templates/yprovider_deployment.yaml#L123
• https://github.com/suitenumerique/docs/blob/main/src/helm/impress/templates/docspec_deployment.yaml#L89

There may be other places I have missed.

Describe alternatives you've considered
I think there is no alternative without manual intervention to move contents from a secret to a configMap, which is not something feasible (and sensible, there is a reason for secrets...).

Discovery, Documentation, Adoption, Migration Strategy
This should be mentioned in the chart's README and the values.yaml, like the other extraVolumes options.