Enhance act as saas docs

doc/development/ee_features.md

@@ -21,7 +21,12 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 When developing locally, there are times when you need your instance to act like the SaaS version of the product.
 In those instances, you can simulate SaaS by exporting an environment variable as seen below:
 
-`export GITLAB_SIMULATE_SAAS=1`
+```shell
+export GITLAB_SIMULATE_SAAS=1
+```
+
+There are many ways to pass an environment variable to your local GitLab instance.
+For example, you can create a `env.runit` file in the root of your GDK with the above snippet.
 
 ## Act as CE when unlicensed