temp: try variables rather than options

Author: BuonOmo

test/config.yml

@@ -12,7 +12,9 @@ connections:
       #
       # This options keyword is referenced here in libpq:
       # https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNECT-OPTIONS
-      options: "-c autocommit_before_ddl=false"
+      # options: "-c autocommit_before_ddl=false"
+      variables:
+        autocommit_before_ddl: false # TODO: check for deep duplicates
     arunit_without_prepared_statements:
       <<: *arunit
       prepared_statements: false