v0.3.0

This release splits the errdefs package into the github.com/containerd/errdefs package which only contains error definitions as well as basic functions to check for those definitions and the github.com/containerd/errdefs/pkg package which containers functionality for using the errdefs, such as error serialization and adding more data to errors.

What's Changed

• Update GitHub Actions packages and runners by @austinvazquez in #20
• Add errdefs/pkg package by @dmcgowan in #19

Full Changelog: v0.2.0...v0.3.0