Nightly build

Rolling build of main at 295ab99. Republished on every push, so the
assets change under the same names. Install with VERSION=nightly or
update nightly; update vX.Y.Z returns to tagged releases.

v0.2.0

Full Changelog: v0.1.0...v0.2.0

Preview build

Rolling pre-release build of the rust-backend branch at 10bf66e.
Republished by every manual run of the Release workflow on a branch other than
main, so the assets change under the same names. Install with update preview
(using deploy/proxmox/the-gathering.sh from that branch); update vX.Y.Z or
update nightly leaves the preview channel. Never marked latest.

v0.1.0

Full Changelog: https://github.com/cfbender/the-gathering/commits/v0.1.0