Fix POSTGRES_PASSWORD unset error

Earlier this year docker-library/postgres introduced a breaking change:
docker-library/postgres#681

adding POSTGRES_HOST_AUTH_METHOD=trust for now to allow demo to start
running. In the long run, we should add production messages for how to
configure passwords and secrets more properly for security.

docker-compose.yaml

@@ -28,6 +28,8 @@ services:
     ports:
       - 127.0.0.1:5432:5432
     restart: always
+    environment:
+      - POSTGRES_HOST_AUTH_METHOD=trust
     logging:
       <<: *logging_default
     volumes: