Fix PSQL dep mismatch

db/structure.sql

@@ -2389,5 +2389,8 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20180829211322'),
 ('20180910143055'),
 ('20180920194120'),
+('20180925203846'),
 ('20180926161918'),
-('20180925203846');
+('20181014231010');
+
+

docker_configs/api.Dockerfile

@@ -1,4 +1,7 @@
 FROM ruby:2.5
+# WHY: We need Postgres 10, not the default (9)
+RUN wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | apt-key add -
+RUN sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main" >> /etc/apt/sources.list.d/pgdg.list'
 RUN apt-get update -qq && apt-get install -y build-essential libpq-dev \
   postgresql postgresql-contrib
 RUN     curl -sL https://deb.nodesource.com/setup_8.x | bash -