Auto tornjak url (#89)

* Autogen jwtIssuer

Unset a default for jwtIssuer and global.spire.jwtIssuer. When unset,
generate it to the default of oidc-discovery.$trustDomain so in many
cases the user doesn't need to set it at all.

Signed-off-by: Kevin Fox <[email protected]>

* Autogen tornjak's apiServerURL

Unset the default tornjak apiServerURL. When unset, default to
https://tornjak-backend.$trustDomain so in many cases users don't
have to set it.

Signed-off-by: Kevin Fox <[email protected]>

* Do more autodetection

Signed-off-by: Kevin Fox <[email protected]>

* Apply suggestions from code review

Co-authored-by: Faisal Memon <[email protected]>
Signed-off-by: kfox1111 <[email protected]>

* Fix docs

Signed-off-by: Kevin Fox <[email protected]>

---------

Signed-off-by: Kevin Fox <[email protected]>
Signed-off-by: kfox1111 <[email protected]>
Co-authored-by: Mariusz Sabath <[email protected]>
Co-authored-by: Faisal Memon <[email protected]>

examples/production/example-your-values.yaml

@@ -20,7 +20,3 @@ spire-server:
 #   ingress:
 #     host: oidc-discovery
 #     tlsSecret: tls-cert
-
-tornjak-frontend:
-  apiServerURL: https://tornjak-backend.production.other/
-

examples/tornjak/values.yaml

@@ -7,7 +7,6 @@ tornjak-frontend:
   service:
     type: ClusterIP
     port: 3000
-  apiServerURL: "http://localhost:10000/"
   resources:
     requests:
       cpu: 50m