Add default emailTemplates

[varac]

See https://github.com/ory/k8s/issues/490:

The kratos.emailTemplates key is not properly rendered by helm docs, it doesn't show up in the README.md table in the first column, but in the last one under kratos.config.

[varac]

Beware of #490, templating the unmodified values in this PR will currently result in this error:

❯ helm -n test template kratos-test .
Error: template: kratos/templates/statefulset-mail.yaml:43:12: executing "kratos/templates/statefulset-mail.yaml" at <include "kratos.annotations.checksum" .>: error calling include: template: kratos/templates/_helpers.tpl:178:30: executing "kratos.annotations.checksum" at <include (print $.Template.BasePath "/configmap-templates.yaml") .>: error calling include: template: kratos/templates/configmap-templates.yaml:13:20: executing "kratos/templates/configmap-templates.yaml" at <.Values.configmap.annotations>: nil pointer evaluating interface {}.configmap

[CLAassistant]

All committers have signed the CLA.

[varac]

Even helm lint fails with the same issue:

❯ helm lint
==> Linting .
[ERROR] templates/: template: kratos/templates/statefulset-mail.yaml:43:12: executing "kratos/templates/statefulset-mail.yaml" at <include "kratos.annotations.checksum" .>: error calling include: template: kratos/templates/_helpers.tpl:178:30: executing "kratos.annotations.checksum" at <include (print $.Template.BasePath "/configmap-templates.yaml") .>: error calling include: template: kratos/templates/configmap-templates.yaml:13:20: executing "kratos/templates/configmap-templates.yaml" at <.Values.configmap.annotations>: nil pointer evaluating interface {}.configmap

Error: 1 chart(s) linted, 1 chart(s) failed

[Demonsthere]

Thanks for the issue and the PR I think we can close this, as I am providing the fix for the cm and indent in https://github.com/ory/k8s/pull/498 :)