jenkins: leaf-build: Set STAGE for init too

Change-Id: I820cd9084e6a6f3d4f865aa580f32e5b1124cb63
diff --git a/jenkins/leaf-build.groovy b/jenkins/leaf-build.groovy
index 9431a3c..dea1a4d 100644
--- a/jenkins/leaf-build.groovy
+++ b/jenkins/leaf-build.groovy
@@ -25,6 +25,7 @@
             steps {
                 script {
                     currentBuild.displayName = "${currentBuild.displayName} (${params.JENKINS_DEVICE})"
+                    env.STAGE = "init"
                 }
                 leaf_build("init")
             }