Fix experimental Drone file

.drone.yml

@@ -1,6 +1,11 @@
 kind: pipeline
 name: tests-integration
 steps:
+  - name: setup
+    image: postgres
+    commands:
+      - sleep 15
+      - cat postgres/*.sql | psql --host pg --user root --db core
   - name: go
     image: golang:1.12
     commands:
@@ -11,11 +16,9 @@ services:
   - name: pg
     image: postgres
     environment:
-      - POSTGRES_USER=root
-      - POSTGRES_PASSWORD=
-      - POSTGRES_DB=core
-    volumes:
-      - ./postgres:/docker-entrypoint-initdb.d:ro
+      POSTGRES_USER: root
+      POSTGRES_PASSWORD: 
+      POSTGRES_DB: core
 trigger:
   branch:
     - master