0.2.0

Features

• Go library callers can supply one registry credential source for every registry request: builder.Options.RegistryAuth reaches BuildKit pulls and pushes, feature downloads and base image reads, and dockercompose forwards its sources to service builds. registryauth.Static holds caller credentials, and registryauth.NewWithoutHelpers reads the Docker client configuration without running credential helpers.

Fixes

• A feature's containerEnv is now expanded as the reference CLI's Dockerfile ENV expands it, in the reference CLI's key order (array-index keys such as 1 first, then the others as declared). A value such as the Go feature's PATH=/usr/local/go/bin:/go/bin:${PATH} keeps the base image's PATH, so the feature installs and the image keeps a working PATH. The generated Dockerfile writes these values the same way.
• A credential source error that makes a build, a feature download or a base image read fail is now part of the returned error, so that errors.Is matches it.