zephyr: Update gitlab docs
This is working now, so updates the docs.
BRANCH=none
TEST=none
@@ -10,8 +10,13 @@ EC.
## Gitlab integration
-As an experiment we have a basic gitlab integration. So far it just builds and
-fails.
+As an experiment we have a basic gitlab integration. It watches the EC repo and
+kicks of a build when new commits appear. So far it just builds for volteer and
+does not run any tests. For firmware branches, it also builds, but fails.
+
+The gitlab builder works without a chroot and uses the Zephyr toolchain. This
+is intended to ensure that we have a path to upstreaming our code eventually and
+do not rely on Chrome OS-specific tools. It does make use of 'zmake', however.
See the piplines [here](https://gitlab.com/zephyr-ec/ec/-/pipelines).
