Add stub to build common OCI spec

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

pkg/cri/sbserver/container_create_windows.go

@@ -24,7 +24,6 @@ import (
 	"github.com/containerd/containerd/oci"
 	"github.com/containerd/containerd/snapshots"
 	imagespec "github.com/opencontainers/image-spec/specs-go/v1"
-	runtimespec "github.com/opencontainers/runtime-spec/specs-go"
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
 
 	"github.com/containerd/containerd/pkg/cri/annotations"
@@ -37,7 +36,7 @@ func (c *criService) containerMounts(sandboxID string, config *runtime.Container
 	return nil
 }
 
-func (c *criService) containerSpec(
+func (c *criService) platformSpec(
 	id string,
 	sandboxID string,
 	sandboxPid uint32,
@@ -49,7 +48,7 @@ func (c *criService) containerSpec(
 	imageConfig *imagespec.ImageConfig,
 	extraMounts []*runtime.Mount,
 	ociRuntime config.Runtime,
-) (*runtimespec.Spec, error) {
+) ([]oci.SpecOpts, error) {
 	specOpts := []oci.SpecOpts{
 		customopts.WithProcessArgs(config, imageConfig),
 	}
@@ -136,7 +135,8 @@ func (c *criService) containerSpec(
 		customopts.WithAnnotation(annotations.ImageName, imageName),
 		customopts.WithAnnotation(annotations.WindowsHostProcess, strconv.FormatBool(sandboxHpc)),
 	)
-	return c.runtimeSpec(id, ociRuntime.BaseRuntimeSpec, specOpts...)
+
+	return specOpts, nil
 }
 
 // No extra spec options needed for windows.