Add support to the sqlite export command to boostrap the DB cache tab…

…le, to keep demos and other sqlite-powered things happy

bin/export-db-to-sqlite.sh

@@ -196,6 +196,11 @@ PROD_DETAILS_STORAGE=product_details.storage.PDFileStorage \
 
 check_status_and_handle_failure "Running Django migrations"
 
+PROD_DETAILS_STORAGE=product_details.storage.PDFileStorage \
+    python manage.py createcachetable || all_well=false
+
+check_status_and_handle_failure "Creating cache table migrations"
+
 # We want to use all the data from the JSON, so let's drop the rows
 # that have been automatically populated during migrate, including all the Wagtail
 # ones, except for wagtailsearch's tables because there's a virtual table that