Added get_domain function

roles/docker-mastodon/templates/env.j2

@@ -3,7 +3,7 @@
 # @see https://github.com/mastodon/mastodon/blob/main/.env.production.sample
 
 
-LOCAL_DOMAIN={{domains[application_id]}}
+LOCAL_DOMAIN={{domains | get_domain(application_id)}}
 ALTERNATE_DOMAINS="{{ domains.mastodon[1:] | join(',') }}"
 SINGLE_USER_MODE={{applications.mastodon.single_user_mode}}
 
@@ -67,7 +67,7 @@ OIDC_SCOPE="openid,profile,email"
 # @see https://stackoverflow.com/questions/72108087/how-to-set-the-username-of-mastodon-by-log-in-via-keycloak
 OIDC_UID_FIELD={{oidc.attributes.username}}
 OIDC_CLIENT_ID={{oidc.client.id}}
-OIDC_REDIRECT_URI=https://{{domains[application_id]}}/auth/auth/openid_connect/callback
+OIDC_REDIRECT_URI=https://{{domains | get_domain(application_id)}}/auth/auth/openid_connect/callback
 OIDC_SECURITY_ASSUME_EMAIL_IS_VERIFIED=true
 OIDC_CLIENT_SECRET={{oidc.client.secret}}
 # uncomment to only use OIDC for login / registration buttons