I looked at another similar question about adding third-party repos. I am trying to add a third-party desktop IM client called riot . While the site gives link to the third-party it gives no instructions as how to add third-party sources or keyring in Debian. I went through https://riot.im/packages/debian/pool/main/ and made the following additions in my /etc/apt/sources.list -
######## Third party repos #######
deb https://riot.im/packages/debian/ stretch main
Now I have two questions :-
a. Is the third-party repo. I have entered is correct or should I ask for more information from upstream.
b. How do I add the secure key as all packages are usually signed in the Debian Universe. The public key is given at https://riot.im/packages/debian/repo-key.asc
I am on Debian stretch/testing.