CI: Why Travis & Circle

[jmh530]

On Thursday, 14 November 2019 at 17:06:36 UTC, Andre Pany wrote:
> [snip]
>
> With the public availability of Github Actions I highly 
> recommend it if you have open source project on Github. If is 
> free and works well with D and Dub.
>
> Kind regards
> Andre

I'm not that familiar with Github Actions, but I should get more 
familiar with it.

But my broader question is why both? Don't they both do largely 
the same things?

I was motivated to ask this by looking at the mir repositories, 
which have both.
https://github.com/libmir/mir