authelia: Set OIDC consent duration

By default, Authelia requires the user to explicitly consent to allow
an application access to personal information *every time the user
authenticates*.  This is rather annoying, so luckily, it provides a
way to remember the consent for a period of time.

authelia/configuration.yml

@@ -38,6 +38,7 @@ identity_providers:
       - email
       - offline_access
       authorization_policy: one_factor
+      pre_configured_consent_duration: 7d
     - id: kubernetes
       description: Kubernetes
       public: true
@@ -45,6 +46,7 @@ identity_providers:
       - http://localhost:8000
       - http://localhost:18000
       authorization_policy: one_factor
+      pre_configured_consent_duration: 7d
 
 log:
   level: trace