cri: Don't use rel path for image volumes

Runc 1.1 throws a warning when using rel destination paths, and runc 1.2
is planning to thow an error (i.e. won't start the container).

Let's just make this an abs path in the only place it might not be: the
mounts created due to `VOLUME` directives in the Dockerfile.

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
(cherry picked from commit 2d64ab8)

pkg/cri/server/container_create.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 	"fmt"
 	"path/filepath"
+	goruntime "runtime"
 	"time"
 
 	"github.com/containerd/containerd"
@@ -304,6 +305,11 @@ func (c *criService) volumeMounts(containerRootDir string, criMounts []*runtime.
 		}
 		volumeID := util.GenerateID()
 		src := filepath.Join(containerRootDir, "volumes", volumeID)
+		if !filepath.IsAbs(dst) && goruntime.GOOS != "windows" {
+			oldDst := dst
+			dst = filepath.Join("/", dst)
+			log.L.Debugf("Volume destination %q is not absolute, converted to %q", oldDst, dst)
+		}
 		// addOCIBindMounts will create these volumes.
 		mounts = append(mounts, &runtime.Mount{
 			ContainerPath:  dst,