docker-compose.yml invalid with disablePostgres

[thegcat]

Generating a docker-compose.yml with disablePostgres: true will output a non-functional file. Trying to start the file will give the error:

Configuration error - Service 'backendAction' depends on service 'postgres' which is undefined.

It seems most services that expect to be able to connect to the DB directly still depends_on: postgres.

[thegcat]

Setting disableDependsOn: true in the config.yml and regenerating the config seems to fix this issue, though it removes all other ordering between the containers too.

[thegcat]

This and #215 are still an issue.