How to use Dub and Digger to build Pull Requests?

[Quirin Schroll]

On Tuesday, 23 May 2023 at 13:50:09 UTC, Quirin Schroll wrote:
> The dlang-bot writes a message to every PR:
>> #### Testing this PR locally
>>
>> If you don't have a local development environment setup, you 
>> can use Digger to test this PR:
>> ```bash
>> dub run digger -- build "master + dmd#<<ISSUE-NUMBER>>"
>> ```
>
> I installed the current DMD (version 2.103.1) and executed the 
> above command; I’m getting the following error:

For the record, I tried multiple PRs and plain `"master"`. It 
doesn’t seem to be related to the particular PR.