Add support for custom certificates in StorageGrid eventsource

[jamesderune]

Is your feature request related to a problem? Please describe.
I work with a custom instance NetApp StorageGrid with a self signed certificate and we can't deploy a StorageGrid Eventsource, because it fails to create a new route.

Describe the solution you'd like
Support for self signed certificates in the StorageGrid Eventsource

Describe alternatives you've considered
We tried to add the certificates to the container, this did not work because the resty client needs certificates to be added manually

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