Add NODE_NAME env to readme example

Author: GilbN

readme-vars.yml

@@ -53,7 +53,8 @@ full_custom_readme: |
   -e CI_S6_VERBOSITY=<optional, Updates the S6_VERBOSITY env. Defaults to '2'> \
   -e CI_LOG_LEVEL=<optional, Sets the ci logging level. Defaults to 'INFO'> \
   -e DOCKER_LOGS_TIMEOUT=<optional, How long to wait in seconds while tailing the container logs before timing out. Defaults to '120'> \
-  -e DRY_RUN=<optional, Set to 'true' when you don't want to upload files to S3 when testing>
+  -e DRY_RUN=<optional, Set to 'true' when you don't want to upload files to S3 when testing> \
+  -e NODE_NAME=<optional, Name of the builder that runs the CI test.> \
   -t lsiodev/ci:latest \
   python3 test_build.py
   ```