How to add an additional config dir in DUB under source?

[tastyminerals]

On Tuesday, 13 October 2020 at 05:13:18 UTC, Mike Parker wrote:
> On Monday, 12 October 2020 at 22:31:53 UTC, tastyminerals wrote:
>
>> [...]
>
> This:
>
> readText("conf.toml");
>
> [...]

Thanks. I remembered that I read about them in Ali's book but 
never actually used them.