Add missing init step declaration in manifest

Without this, the init step was not called during Gerrit site init.

Bug: Issue 10014
Change-Id: I1dd0a573427e4a7e5e75779170727fddabbb7e28
diff --git a/BUILD b/BUILD
index 7fec2ea..7d5fad8 100644
--- a/BUILD
+++ b/BUILD
@@ -13,6 +13,7 @@
         "Gerrit-PluginName: high-availability",
         "Gerrit-Module: com.ericsson.gerrit.plugins.highavailability.Module",
         "Gerrit-HttpModule: com.ericsson.gerrit.plugins.highavailability.HttpModule",
+        "Gerrit-InitStep: com.ericsson.gerrit.plugins.highavailability.Setup",
         "Implementation-Title: high-availability plugin",
         "Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/high-availability",
     ],