cloud/bmdb: add up/down migration test

This isn't very exhaustive, but it's enough to catch migration issues
which we already had.

Change-Id: Ie26b7646bb8b051a613e75cb69a1708f9288a0cc
Reviewed-on: https://review.monogon.dev/c/monogon/+/1137
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/cloud/bmaas/bmdb/model/migrations/1662136250_initial.down.sql b/cloud/bmaas/bmdb/model/migrations/1662136250_initial.down.sql
index 5f336d1..5c0ebe9 100644
--- a/cloud/bmaas/bmdb/model/migrations/1662136250_initial.down.sql
+++ b/cloud/bmaas/bmdb/model/migrations/1662136250_initial.down.sql
@@ -1,3 +1,4 @@
 DROP TABLE work;
 DROP TABLE sessions;
 DROP TABLE machines;
+DROP TYPE process;
\ No newline at end of file