test: fix setup of the postgres container used in tests (#398)

Refs: docker-library/postgres#1259

Author: trentm

docker-compose-elastic-cloud.yml

@@ -79,7 +79,7 @@ services:
       - POSTGRES_PASSWORD=hunter2
       - POSTGRES_DB=opbeans
     volumes:
-      - pgdata:/var/lib/postgresql/data
+      - pgdata:/var/lib/postgresql
     ports:
       - "127.0.0.1:5432:5432"
     healthcheck:

docker-compose.yml

@@ -129,7 +129,7 @@ services:
       - POSTGRES_PASSWORD=hunter2
       - POSTGRES_DB=opbeans
     volumes:
-      - pgdata:/var/lib/postgresql/data
+      - pgdata:/var/lib/postgresql
     ports:
       - "127.0.0.1:5432:5432"
     healthcheck: