Add readiness endpoints to all services

[jbygdell]

Description

Using the container port for readiness check doesn't work for dataedge and res due to authentication requirements.

Proposed solution

Add an non password protected endpoint to all services, /check or similar, that will return a 200 once the app is fully started.

Definition of Done

A non protected endpoint exists that will return a 200 when the app is fully started.

[anandmohan777]

@jbygdell We are using TCP liveness probe in all the services, we use the same for readiness probe?

[jbygdell]

I use the liveness probes as well, but they report ok before the service is ready to accept external connections.