[Installer]: In-cluster docker registry doesn't support non-default namespace

[mrsimonemms]

Bug description

In the templates in /installer/third_party/charts/docker-registry, the downloaded charts in docker-registry-1.11.0.tgz don't specify the metadata.namespace: {{ .Release.Namespace }} property. This means that the generated charts won't get installed to the same namespace if the namespace is not default

Steps to reproduce

Run gitpod-installer render -c /path/to/config --namespace custom-nsp and search for the docker-registry components

Workspace affected

No response

Expected behavior

No response

Example repository

No response

Anything else?

This can be fixed in the following ways:

1. Import the files from the chart rather than using them as a Helm dependency. This is simpler, but has the added risk of this change being forgotten if we ever update the dependency
2. post-process the generated YAML in installer/pkg/components/docker-registry/helm.go. It's potentially a dirtier solution, but means we can still use the third party dependency
3. apply fix to dependency