Add a buildgrid service image to CI
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 237c43e..c37bb4d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,10 @@
 image: buildstream/testsuite-debian:9-5da27168-32c47d1c
 
+services:
+  - jimmacarthur/buildgrid-test:buildgrid_buildbox_server
+
+# How do we attach a volume?
+
 cache:
   key: "$CI_JOB_NAME-"
   paths: