Upgrade to postgres 10.15

We need to upgrade to Postgres 12 by mid-February. We can't go directly, we need to go via Postgres 10 - https://docs.cloud.service.gov.uk/deploying_services/postgresql/#upgrade-to-postgresql-10.

Upgrade dmrunner to use postgres 10 so we can test locally. After pulling this commit, you will need to run `make data` to re-initialise the database.

We need to add `POSTGRES_HOST_AUTH_METHOD` because the postgres docker container has changed to require it: docker-library/postgres#658

Author: bjgill

config/docker-compose.yml

@@ -8,14 +8,15 @@ volumes:
 
 services:
   postgres:
-    image: "postgres@sha256:f4603c7b8aaf418393edb8cd5e2d1abd91d686ab571302dc83f887ea4a56286b"
+    image: "postgres:10.15@sha256:95f79893ef4d769277f7687b03bb24fe77a49ad2ec1c269f89a0cf849d6f4c7b"                                                                   
     ports:
       - "5432:5432"
     volumes:
       - ./sql:/docker-entrypoint-initdb.d
       - postgres-data:/var/lib/postgresql/data
     environment:
       POSTGRES_USER: $USER
+      POSTGRES_HOST_AUTH_METHOD: trust
 
   elasticsearch:
     image: "elasticsearch:7.9.3"