Feature toggle for Istio based jwt handler

[strekm]

Description

Implement feature flag (named e.g. istioJwt) for handling istio based jwt handler. Feature flag should be passed to api-gateway controller as environment variable. Default values should be false. Feature toggle should control behaviour of jwt handler (changing logic of jwt handler is out of scope). Default false value of feature toggle means that jwt handler implementation is based on ORY oathkeeper, true value switches behaviour to jwt implementation based on Istio (implementation out of scope).

Reasons

Support for early implementation of jwt handler based on Istio

Attachments

Part of: #30

[videlov]

PRs:

• Configmap configuration #43