// pushing all images drops to sub-second times, with the registry being the bottleneck (which could
// also use sha256-simd possibly).
func RunCrane(ctx context.Context, a Args) error {
	ctx, span := tracing.Start(ctx, "RunCrane")
	defer span.End()
	g := errgroup.Group{}

	variants := sets.New(a.Variants...)
	// hasDoubleDefault checks if we defined both DefaultVariant and PrimaryVariant. If we did, these

	name string
}

var (
	bases   = map[baseKey]v1.Image{}
	basesMu sync.RWMutex
)

func WarmBase(ctx context.Context, architectures []string, baseImages ...string) {
	_, span := tracing.Start(ctx, "RunCrane")
	defer span.End()
	basesMu.Lock()
	wg := sync.WaitGroup{}
	wg.Add(len(baseImages) * len(architectures))
	resolvedBaseImages := make([]v1.Image, len(baseImages)*len(architectures))
	keys := []baseKey{}

		// The crane builder is much faster but less tested.
		// Neither builder is doing standard logic; see each builder for details.
		if args.Builder == CraneBuilder {
			return RunCrane(ctx, args)
		}

		return RunDocker(args)
	},
}

func ValidateArgs(a Args) error {
	if len(a.Targets) == 0 {
		return fmt.Errorf("no targets specified")
	}
	if a.Push && a.Save {