Rdanzey/helm-fixes-existing-db-secrets

[Arkaniad]

Fixes some Helm templating issues when setting up a deployment with an existing database / signing keys.

• Allows for .Values.postgresql.enabled: false as long as .Values.global.dendrite_config.database.connection_string is defined
• Allows for '.Values.signing_key.create: false' if .Values.signing_key.existingSecret is set

Also fixes an error in the template resulting in profiling port not being set correctly:

Error: template: dendrite-meta/charts/dendrite/templates/deployment.yaml:60:35: executing "dendrite-meta/charts/dendrite/templates/deployment.yaml" at <$.Values.global.profiling.port>: nil pointer evaluating interface {}.port

Pull Request Checklist

• I have added Go unit tests or Complement integration tests for this PR or I have justified why this PR doesn't need tests
  • Helm template fixes, no golang changes
• Pull request includes a sign off below using a legally identifiable name or I have already signed off privately

Signed-off-by: Rhea Danzey [email protected]