Make it possible to cache programs from the lms

To do so, it is necessary to create a dedicated user.

README.rst

@@ -53,3 +53,16 @@ Re-indexing courses
   
   tutor local run discovery ./manage.py refresh_course_metadata
   tutor local run discovery ./manage.py update_index --disable-change-limit
+
+Caching programs
+~~~~~~~~~~~~~~~~
+
+In order to cache programs in the LMS, you will need to manually create a catalog integration. This step should be performed just once::
+    
+    tutor local run lms ./manage.py lms create_catalog_integrations --enabled \
+        --internal_api_url=http://discovery:8000 \
+        --service_username=lms_catalog_service_user
+
+Then::
+    
+    tutor local run lms ./manage.py lms cache_programs

tutordiscovery/templates/discovery/hooks/lms/init

@@ -1,6 +1,9 @@
-./manage.py lms --settings=tutor.production manage_user discovery discovery@{{ LMS_HOST }} --staff --superuser
+export DJANGO_SETTINGS_MODULE=$SERVICE_VARIANT.envs.$SETTINGS
 
-./manage.py lms --settings=tutor.production create_oauth2_client \
+./manage.py lms manage_user discovery discovery@{{ LMS_HOST }} --staff --superuser
+./manage.py lms manage_user lms_catalog_service_user lms_catalog_service_user@{{ LMS_HOST }}
+
+./manage.py lms create_oauth2_client \
     "{% if ACTIVATE_HTTPS %}https{% else %}http{% endif %}://{{ DISCOVERY_HOST }}" \
     "{% if ACTIVATE_HTTPS %}https{% else %}http{% endif %}://{{ DISCOVERY_HOST }}/complete/edx-oidc/" \
     confidential \