feat(common): add support for automatic configmaps from file/path

[PrivatePuffin]

Is your feature request related to a problem?

currently configmaps from files can be done, but its not the easiest process.

Describe the solution you'd like

We should do something like bjws-s common does: https://github.com/bjw-s/helm-charts/blob/8f66d48e6e21704bd62ffa12e70333aa3e3cf117/charts/library/common/values.yaml#L486

Describe alternatives you've considered

Keeping it as is, but no progress is not a realistic option

Additional context

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I've read and agree with the following

• [x] I've checked all open and closed issues and my request is not there.
• [x] I've checked all open and closed pull requests and my request is not there.