[prometheus-snmp-exporter] move config map to secret

[ThomasUllrich666]

Describe the bug a clear and concise description of what the bug is.

currently the values.config parameter will setup a configmap that contains the snmp.yaml configuration. Due to the fact that the snmp.yaml file can include authentication parameter used for snmp auth, it would be better to migrate the entire config to a secret instead of a configmap.

not sure if this is a feature request, bug or security vulnerability. :-)

What's your helm version?

v3.15.3

What's your kubectl version?

v1.27.16+03a907c

Which chart?

prometheus-snmp-exporter

What's the chart version?

prometheus-snmp-exporter-5.6.0

What happened?

No response

What you expected to happen?

use secret instead of config map

How to reproduce it?

No response

Enter the changed values of values.yaml?

No response

Enter the command that you execute and failing/misfunctioning.

helm upgrade --install prometheus-snmp-exporter prometheus-community/prometheus-snmp-exporter -f values.yaml --set-file config=snmp.yaml

Anything else we need to know?

No response