ci: update services section

service/ci.md

@@ -589,9 +589,10 @@ example, [those instructions](https://medium.com/prgcont/using-buildah-in-gitlab
 GitLab CI, at TPO, currently runs the following services:
 
  * continuous integration: mostly testing after commit
+ * static website building and deployment
+ * [shadow](https://github.com/shadow/shadow) simulations, large and small
 
-This is currently used by many teams and is quickly becoming a
-critical service.
+This is currently used by many teams and is a critical service.
 
 ### Possible services