fix: override namespace with templating

[on2e]

Setting the namespace of the OpenProject Helm chart with helm template is not possible since the OP namespaced resources have no templated namespace properties. If you run:

$ cd charts/openproject
$ helm template myrelease -n myns . 2>/dev/null | grep namespace: | wc -l
8

you will notice that only the PostgreSQL and Memcached subchart resources are getting the specified namespace.

If you run:

helm template -n myns ... | kubectl apply -f -

the subchart resources will be deployed in the myns namespace but the OP resources will be deployed in the default namespace.

To fix this, since the OP Helm chart already depends on the Bitnami common library chart, we can use its common.names.namespace template for namespace overriding, e.g. namespace: {{ include "common.names.namespace" . }}. Now the OP resources are also getting the myns namespace:

$ helm template myrelease -n myns . 2>/dev/null | grep namespace: | wc -l
20

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