Adding support for camunda pods namespace

[jastonitas]

Adding support for camunda pods namespace configuration from values.yaml file

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[jastonitas]

I already signed the CLA but seems like the workflow check is not taking it :)

[aabouzaid]

Thanks for your contribution @jastonitas
There are a couple of things here.

1. Please add the namespace to all namespaced resources (not just deployment).
2. Set the value under .Values.general.namespace and default it to .Release.Namespace, so it will be like this:

namespace: {{ .Values.general.namespace | default .Release.Namespace }}

3. Add the value to the main values.yaml file:

general:
[...]
  namespace: ""

4. To test the changes, add custom value to the file ci/custom-values.yaml:

  general:
[...]
  namespace: camunda