You can download freedombox and put it on an rpi to get matrix-synapse on it. Took me an hour to get a Matrix server running which then you can use with Riot and it works perfectly.
Now if you mean to get your own local riot frontend for it, I thought there were some docker scripts that would let you do that quickly but I haven't tried those.
Now if you mean to get your own local riot frontend for it, I thought there were some docker scripts that would let you do that quickly but I haven't tried those.