set stagingUser and stagingServer in StoreBuildID method

tools/release/Bootstrap/Step/Build.pm

@@ -185,6 +185,8 @@ sub StoreBuildID() {
     my $productTag = $config->Get(var => 'productTag');
     my $rc = $config->Get(var => 'rc');
     my $logDir = $config->Get(sysvar => 'logDir');
+    my $stagingUser = $config->Get(var => 'stagingUser');
+    my $stagingServer = $config->Get(var => 'stagingServer');
 
     my $rcTag = $productTag . '_RC' . $rc;
     my $buildLog = catfile($logDir, 'build_' . $rcTag . '-build.log');