feat(block): adding block volume support for ZFSPV (#102)

This commit adds the support for creating a Raw Block Volume request using volumemode as block in PVC :-

```
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: block-claim
spec:
  volumeMode: Block
  storageClassName: zfspv-block
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
```

The driver will create a zvol for this volume and bind mount the block device at the given path.

Signed-off-by: Pawan <pawan@mayadata.io>

tests/container/container.go

@@ -254,6 +254,29 @@ func (b *Builder) WithVolumeMountsNew(volumeMounts []corev1.VolumeMount) *Builde
 	return b
 }
 
+// WithVolumeDevicesNew sets the command arguments of the container
+func (b *Builder) WithVolumeDevicesNew(volumeDevices []corev1.VolumeDevice) *Builder {
+	if volumeDevices == nil {
+		b.errors = append(
+			b.errors,
+			errors.New("failed to build container object: nil volumeDevices"),
+		)
+		return b
+	}
+
+	if len(volumeDevices) == 0 {
+		b.errors = append(
+			b.errors,
+			errors.New("failed to build container object: missing volumeDevices"),
+		)
+		return b
+	}
+	newvolumeDevices := []corev1.VolumeDevice{}
+	newvolumeDevices = append(newvolumeDevices, volumeDevices...)
+	b.con.VolumeDevices = newvolumeDevices
+	return b
+}
+
 // WithImagePullPolicy sets the image pull policy of the container
 func (b *Builder) WithImagePullPolicy(policy corev1.PullPolicy) *Builder {
 	if len(policy) == 0 {