Add all valid arches to ImageLoad

We should expand the list of supported arches to be able to build them if we want. Without this we will stuck on sending tarball during build for riscv64.

Signed-off-by: Petr Fedchenkov <giggsoff@gmail.com>

src/cmd/linuxkit/cache/write.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	"github.com/containerd/containerd/reference"
+	"github.com/estesp/manifest-tool/v2/pkg/util"
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
@@ -117,13 +118,10 @@ func (p *Provider) ImageLoad(ref *reference.Spec, architecture string, r io.Read
 		tr    = tar.NewReader(r)
 		index bytes.Buffer
 	)
-	var suffix string
-	switch architecture {
-	case "amd64", "arm64", "s390x":
-		suffix = "-" + architecture
-	default:
-		return ImageSource{}, fmt.Errorf("Unknown arch %q", architecture)
+	if !util.IsValidOSArch(linux, architecture, "") {
+		return ImageSource{}, fmt.Errorf("unknown arch %s", architecture)
 	}
+	suffix := "-" + architecture
 	imageName := ref.String() + suffix
 	log.Debugf("ImageWriteTar to cache %s", imageName)
 	for {