riscv64 snap build request for snapcraft.io/chisel

Hello. The chisel snap (https://snapcraft.io/chisel) is being automatically built on commits to the GitHub source repo: https://github.com/canonical/chisel.

We would like to enable riscv64 builds for this snap.

It seems to me that the builds are taking place here: https://launchpad.net/~build.snapcraft.io/+snap/451570faa3e40fbaf73a83318d197162.
I am not sure if this is a permanent link though. We have recently changed the source for this snap and the previous launchpad link has disappeared. For the foreseeable future, the current source repo is going to persist.

Please help me enable riscv64 builds for the chisel snap. If there's some process I have to follow before doing so, please outline them. Thank you!