v0.4.0

This is a release in the Singleton series which allows you to deploy one application at a time.

What's Changed

• README: Add YouTube video by @richiejp in #10
• srv: Allow setting listen address by @richiejp in #11
• analysis: Stop on error by @richiejp in #12
• Use Buildkit client instead of Buildctl by @richiejp in #13

Full Changelog: v0.3.0...v0.4.0