For those who don't have their own Autonomous System, but want to play with RPKI validation, you can join DN42 [1] and validate routes there.

Netravnen kindly provides a route export compatible with GoRTR and Routinator [2], which has been working nicely for me.

[1] https://dn42.us

[2] https://github.com/netravnen/dn42-roa-export