Broken Release.gpg for apt repository

Hi,
it seems that

https://download.jitsi.org/stable/Release.gpg

is broken.

file says it is data:

$ file Release.gpg 
Release.gpg: data 

What should be returned:

$ file Release.gpg 
Release.gpg: PGP signature 

This results in failure messages when setting up a local mirror of jitsi and clients then wanting to perform an update from repositories:
Detatched signature file [] is in unsupported binary format

It would be nice if that could be fixed.

Thanks.