On Fri, 2 Jul 2021, Jan U. Hasecke wrote:

> 
> Dear Hans,
> 
> thanks for the hint to the repo. I remember that it was mentiooned before.
> 
> Am 02.07.21 um 10:42 schrieb Hans Hagen:
> > official    : https://bitbucket.org/phg/context-mirror/src/beta/

There is also

github: https://github.com/contextgarden/context-mirror

which simply mirrors the bitbucket repo.

> Is there a how-to-bootstrap-from-repository? How can I get a running 
> context with the repo?

These repos contain just the contents on texmf-context, but not the binaries (or sources of binaries). You need the binaries (and fonts!) to get a working installation. 

Aditya