Prepare `v0.82.1` (#8)

This is a point release to sneak in a `proto` module that was omitted in
`v0.82.0`

cnidarium: release `v0.82.0` (#7)

cnidarium: prepare `v0.81.0` (#4)

This bumps the version to `v0.81.0` to cut a release including #3

ci: add release workflow!