Updated JWT authentication settings for Credentials Service (#3659)

This brings the service inline with our other services.

ECOM-6938

playbooks/roles/credentials/defaults/main.yml

@@ -154,6 +154,16 @@ NGINX_CREDENTIALS_GUNICORN_HOSTS:
 
 CREDENTIALS_EXTRA_APPS: []
 
+CREDENTIALS_JWT_AUDIENCE: '{{ EDXAPP_JWT_AUDIENCE | default("SET-ME-PLEASE") }}'
+CREDENTIALS_JWT_ISSUER: '{{ CREDENTIALS_OAUTH_URL_ROOT }}'
+CREDENTIALS_JWT_SECRET_KEY: '{{ EDXAPP_JWT_SECRET_KEY | default("lms-secret") }}'
+
+CREDENTIALS_JWT_AUTH:
+  JWT_ISSUERS:
+    - AUDIENCE: '{{ CREDENTIALS_JWT_AUDIENCE }}'
+      ISSUER: '{{ CREDENTIALS_JWT_ISSUER }}'
+      SECRET_KEY: '{{ CREDENTIALS_JWT_SECRET_KEY }}'
+
 CREDENTIALS_SERVICE_CONFIG:
   SECRET_KEY: '{{ CREDENTIALS_SECRET_KEY }}'
   TIME_ZONE: '{{ CREDENTIALS_TIME_ZONE }}'
@@ -198,6 +208,8 @@ CREDENTIALS_SERVICE_CONFIG:
   USER_JWT_AUDIENCE: '{{ CREDENTIALS_USER_API_JWT_AUDIENCE }}'
   USER_JWT_SECRET_KEY: '{{ CREDENTIALS_USER_API_JWT_SECRET_KEY }}'
 
+  JWT_AUTH: '{{ CREDENTIALS_JWT_AUTH }}'
+
 #
 # vars are namespace with the module name.
 #