An artifact may name which stage of its recipe to stop at

One source, two images, deliberately different: a toolchain carries a compiler
and the image the same module runs in should not.

internal/builder/builder.go

@@ -239,6 +239,9 @@ func one(ctx context.Context, run Runner, publish Publisher,
 		// The bases this module named, resolved to what this mesh holds. A recipe reads them as
 		// build arguments, so a module says which module it stands on and never which copy.
 		invocation := append([]string{"build", "-f", a.From, "-t", local}, args...)
+		if a.Target != "" {
+			invocation = append(invocation, "--target", a.Target)
+		}
 		invocation = append(invocation, ".")
 		if _, err := run(ctx, tree, "docker", invocation...); err != nil {
 			return catalogue.Built{}, fmt.Errorf("%s: building %s failed: %w", module, a.Name, err)