Few months ago I asked on arch-dev whether we would like to ask for access to Cloud Native Computing Foundation cluster, which we could use to experiment with automated package builds (or anything else really).
Following no response I actually did so anyway and I have been invited to CNCF organization on packet.net, where we can spawn new dedicated machines for fun and profit. Obvious caveat is that we are guests and shouldn't abuse it; less obvious one is that packet.net does not support Arch out-of-the-box but it can be achieved via PXE and cloud-init (currently residing in AUR?).
I just realized I never communicated this properly so here it is. Let me know if there's anything you would like to try.