Add the 'BuildCSIVolumes' feature gate to the tech preview set.

This allows CSI volumes provided by the 'CSIDriverSharedResource' feature gate
to be included in DockerBuildStrategy and SourceBuildStrategy Builds in
OpenShift.  Currently, this should only be installed on clusters that opt into
tech preview features.

config/v1/types_feature.go

@@ -120,6 +120,7 @@ var FeatureSets = map[FeatureSet]*FeatureGateEnabledDisabled{
 		with("ExternalCloudProvider").      // sig-cloud-provider, jspeed, OCP specific
 		with("InsightsOperatorPullingSCA"). // insights-operator/ccx, tremes, OCP specific
 		with("CSIDriverSharedResource").    // sig-build, adkaplan, OCP specific
+		with("BuildCSIVolumes").            // sig-build, adkaplan, OCP specific
 		toFeatures(),
 	LatencySensitive: newDefaultFeatures().
 		with(