feat: default to use data checksums in PostgreSQL

There is little reason not to use PostgreSQL data checksums [1] and they
can greatly help to ensure data integrity.

[1] https://www.postgresql.org/docs/current/checksums.html

docker-compose/postgres/docker-compose.yaml

@@ -5,6 +5,7 @@ services:
   postgres:
     image: docker.io/library/postgres:16.2
     environment:
+      - POSTGRES_INITDB_ARGS=${POSTGRES_INITDB_ARGS---data-checksums}
       - POSTGRES_USER=${POSTGRES_USER}
       - POSTGRES_PASSWORD_FILE=/run/secrets/postgres_password
       # (Optional) when creating a new database