ci(tangled): curse my CI run with the xe-site-ci serviceaccount

Signed-off-by: Xe Iaso <me@xeiaso.net>

Author: Xe

.tangled/workflows/xesite.yaml

@@ -7,6 +7,7 @@ engine: tack
 tack:
   tekton:
     pipeline: xe-site-build-test-deploy
+    service_account: xe-site-ci
     workspaces:
       - name: repo-data
         access_modes: ["ReadWriteOnce"]