v3.0.0-beta1

Revamp configuration loading and storing. Including breaking changes to ENV variables controlling it.

You can see the whole diff in the CHANGELOG.md

oc secret new-basicauth threescale-portal-endpoint-secret --password=https://access-token@account-admin.3scale.net
oc new-app -f https://github.com/3scale/apicast/releases/download/v3.0.0-beta1/openshift-template.yml