Build with previews

[Herringway]

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System information

• dub version: dub v1.29.0
• OS Platform and distribution: Windows 10 (x86-64)
• compiler version: dmd 2.100.0

Bug Description

It should be possible to perform a build with relevant -preview switches turned on for testing purposes, without having to modify the package configs, possibly being able to specify an arbitrary combination

How to reproduce?

Run dub with every option, hoping one of them does what I am requesting.

Expected Behavior

dub passes -preview=all or some other combination of -preview switches to dmd on request.

Logs

This is where I'd put the logs... If I had any!