Add variables for 1.15

prow.sh

@@ -170,6 +170,7 @@ configvar CSI_PROW_HOSTPATH_CANARY "" "hostpath image"
 # CSI_PROW_E2E_REPO=none disables E2E testing.
 configvar CSI_PROW_E2E_VERSION_1_13 v1.14.0 "E2E version for Kubernetes 1.13.x" # we can't use the one from 1.13.x because it didn't have --storage.testdriver
 configvar CSI_PROW_E2E_VERSION_1_14 v1.14.0 "E2E version for Kubernetes 1.14.x"
+configvar CSI_PROW_E2E_VERSION_1_15 v1.15.0 "E2E version for Kubernetes 1.15.x"
 # TODO: add new CSI_PROW_E2E_VERSION entry for future Kubernetes releases
 configvar CSI_PROW_E2E_VERSION_LATEST master "E2E version for Kubernetes master" # testing against Kubernetes master is already tracking a moving target, so we might as well use a moving E2E version
 configvar CSI_PROW_E2E_REPO_LATEST https://github.com/kubernetes/kubernetes "E2E repo for Kubernetes >= 1.13.x" # currently the same for all versions
@@ -277,6 +278,7 @@ configvar CSI_PROW_E2E_ALPHA "$(get_versioned_variable CSI_PROW_E2E_ALPHA "${csi
 # it anymore for older releases.
 configvar CSI_PROW_E2E_ALPHA_GATES_1_13 'VolumeSnapshotDataSource=true,BlockVolume=true,CSIBlockVolume=true' "alpha feature gates for Kubernetes 1.13"
 configvar CSI_PROW_E2E_ALPHA_GATES_1_14 'VolumeSnapshotDataSource=true,ExpandCSIVolumes=true' "alpha feature gates for Kubernetes 1.14"
+configvar CSI_PROW_E2E_ALPHA_GATES_1_15 'VolumeSnapshotDataSource=true,ExpandCSIVolumes=true' "alpha feature gates for Kubernetes 1.15"
 # TODO: add new CSI_PROW_ALPHA_GATES_xxx entry for future Kubernetes releases and
 # add new gates to CSI_PROW_E2E_ALPHA_GATES_LATEST.
 configvar CSI_PROW_E2E_ALPHA_GATES_LATEST 'VolumeSnapshotDataSource=true,ExpandCSIVolumes=true' "alpha feature gates for latest Kubernetes"