[ENHANCEMENT] Adding extra resources in the chart

[aqeelat]

Describe the use case:

We're using SealedSecrets to store the elasticsearch password. It would be great if I can include this resource in the values.yaml and have it deployed with camunda.

Describe the enhancement/feature:

An empty array called extraDeploy that I can fill with yaml.

Desired outcome and acceptance tests:

The yaml in extraDeploy is then templated as valid k8s manifests.

[jessesimpson36]

I think the scope of this github issue is mostly about generic resources, and not specific to SealedSecrets. Great idea!