Add ingress

[nsklikas]

Add ingress relation.

To test this on a model that has kratos deployed you need to run (we need channel=latest/edge due to canonical/traefik-k8s-operator#114):

juju deploy traefik-k8s traefik-public --channel latest/edge
juju deploy traefik-k8s traefik-admin --channel latest/edge
juju config traefik-public external_hostname=some_host
juju config traefik-admin external_hostname=some_host
juju relate traefik-public kratos:public-ingress
juju relate traefik-admin kratos:admin-ingress

After all models in the unit reach an active state, get the traefik IPs by running:

juju status
...
traefik-admin/0*                  active       idle   {admin_IP}         
traefik-public/0*                  active       idle   {public_IP}         

Then on your browser you should be able to reach Kratos APIs through these IPs (eg http://{admin_IP}/{juju_model_name}-kratos/admin/identities and http://{public_IP}/{juju_model_name}-kratos/.well-known/ory/webauthn.js).

Currently there is a problem with the traefik charm and all traffic will be redirected to the Kratos leader.

[natalian98]

Would it be possible to add some integration test for this relation and/or update the readme?
I also see that the traefik fix was merged (rev98), maybe we could add a note about minimal revision?