Don't reuse/overwrite random host directories.

docker-compose.yml

@@ -4,7 +4,9 @@ services:
     build: postgres-hstore
     restart: always
     volumes:
-      - /var/spejstore-data:/var/lib/postgresql/data
+      - spejstore-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_HOST_AUTH_METHOD: trust
 
   web:
     build: .
@@ -20,3 +22,6 @@ services:
     env_file:
       - spejstore-dev.env
       - spejstore.env
+
+volumes:
+  spejstore-data: