[at-spi2-core: 5/7] Note how templates in the CI use environment variables

[Federico Mena Quintero <federico src gnome org>]

commit 7cfb590f7dac7c03af070e2cd27e0ab698992087
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Dec 15 12:32:05 2021 -0600

    Note how templates in the CI use environment variables

 devel-docs/gitlab-ci.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/devel-docs/gitlab-ci.md b/devel-docs/gitlab-ci.md
index b5706711..d4077d46 100644
--- a/devel-docs/gitlab-ci.md
+++ b/devel-docs/gitlab-ci.md
@@ -117,7 +117,9 @@ time.  In our configuration, the `.only-default` template has the
 `.build-setup` template is for the analysis jobs, and it lets them
 declare `EXTRA_DEPS` as an environment variable with the names of
 extra dependencies: for example, the coverage job puts `lcov` in
-`EXTRA_DEPS`.
+`EXTRA_DEPS`.  The commands in `before_script` blocks use these
+environment variables to install the package dependencies, for example
+`zypper install -y ${PROJECT_DEPS}` for an openSUSE job.
 
 The `build` stage has these jobs: