DUB option to choose local DUB registry workspace

[bruno-medeiros]

The local DUB registry (ie, the directory with the local-packages.json file, as well as downloaded DUB packages), shouldn't be hardcoded to a single default. There should be a global option to control with location to use. The main use case for this is for test suites that use DUB (--bare is not fully adequate for this purpose).

[wilzbach]

(related to #557 and #383)

[andre2007]

For test suites the a good solution is to adapt the environment variable HOME while calling dub.
Does this solve your issue?

[Geod24]

We now have --skip-registry and the ability to specify the registry in dub.settings.json.