adds support for configuring the containerd runtime engine

Signed-off-by: Mike Brown <brownwm@us.ibm.com>

pkg/server/container_create.go

@@ -147,7 +147,7 @@ func (c *criContainerdService) CreateContainer(ctx context.Context, r *runtime.C
 
 	// Set snapshotter before any other options.
 	opts := []containerd.NewContainerOpts{
-		containerd.WithSnapshotter(c.config.ContainerdSnapshotter),
+		containerd.WithSnapshotter(c.config.ContainerdConfig.Snapshotter),
 		// Prepare container rootfs. This is always writeable even if
 		// the container wants a readonly rootfs since we want to give
 		// the runtime (runc) a chance to modify (e.g. to create mount
@@ -223,9 +223,11 @@ func (c *criContainerdService) CreateContainer(ctx context.Context, r *runtime.C
 	opts = append(opts,
 		containerd.WithSpec(spec, specOpts...),
 		containerd.WithRuntime(
-			defaultRuntime,
-			&runcopts.RuncOptions{SystemdCgroup: c.config.SystemdCgroup},
-		),
+			c.config.ContainerdConfig.Runtime,
+			&runcopts.RuncOptions{
+				Runtime:       c.config.ContainerdConfig.RuntimeEngine,
+				RuntimeRoot:   c.config.ContainerdConfig.RuntimeRoot,
+				SystemdCgroup: c.config.SystemdCgroup}), // TODO (mikebrow): add CriuPath when we add support for pause
 		containerd.WithContainerLabels(map[string]string{containerKindLabel: containerKindContainer}),
 		containerd.WithContainerExtension(containerMetadataExtension, &meta))
 	var cntr containerd.Container