fix: Parallelize migrate commands

bin/migrate

@@ -1,17 +1,24 @@
 #!/bin/bash
 set -e
 
-python manage.py migrate
-python manage.py migrate_clickhouse
+python manage.py migrate & 
+pid1=$!
+
+python manage.py migrate_clickhouse &
 
 # NOTE: we do not apply any non-noop migrations here. Rather these are run
 # manually within the UI. See https://posthog.com/docs/runbook/async-migrations
 # for details.
-python manage.py run_async_migrations --complete-noop-migrations
+python manage.py run_async_migrations --complete-noop-migrations &
 
 # NOTE: this check should not fail if a migration isn't complete but within the
 # given async migration posthog version range, thus this should not block e.g.
 # k8s pod deployments.
-python manage.py run_async_migrations --check
+python manage.py run_async_migrations --check &
+
+python manage.py sync_replicated_schema &
+
+pid2=$!
 
-python manage.py sync_replicated_schema
+wait $pid1
+wait $pid2