Add .prow.sh to enable prow jobs

Change-Id: I1142fc76b939c03ba05070179b5ab9574c096571

Author: msau42

.prow.sh

@@ -0,0 +1,11 @@
+#! /bin/bash
+
+# A Prow job can override these defaults, but this shouldn't be necessary.
+
+# Only these tests make sense for csi-driver-nfs until we can integrate k/k
+# e2es.
+: ${CSI_PROW_TESTS:="unit"}
+
+. release-tools/prow.sh
+
+main