:construction_worker: GitHub Actions CI workflow to publish to crates.io
Based on https://crates.io/docs/trusted-publishing, though the trusted publishing doesn't work yet as this is the first release.
:technologist: Add contributors section to changelog template
Acknowledge commit contributions, even if it's just me right now! Usernames pulled from GitHub requires using a token, passed to `release-plz update --github-token <token>`.