Update documentation

CHANGELOG

@@ -26,6 +26,7 @@ v 8.10.0 (unreleased)
   - Escape file extension when parsing search results !5141 (winniehell)
   - Apply the trusted_proxies config to the rack request object for use with rack_attack
   - Upgrade to Rails 4.2.7. !5236
+  - Extend exposed environment variables for CI builds
   - Allow to pull code with deploy key from public projects
   - Add Sidekiq queue duration to transaction metrics.
   - Add a new column `artifacts_size` to table `ci_builds` !4964

doc/ci/variables/README.md

@@ -71,6 +71,9 @@ export CI_PROJECT_PATH="gitlab-org/gitlab-ce"
 export CI_PROJECT_URL="https://gitlab.com/gitlab-org/gitlab-ce.git"
 export CI_REGISTRY="registry.gitlab.com"
 export CI_REGISTRY_IMAGE="registry.gitlab.com/gitlab-org/gitlab-ce"
+export CI_RUNNER_ID="10"
+export CI_RUNNER_DESCRIPTION="my runner"
+export CI_RUNNER_TAGS="docker, linux"
 export CI_SERVER="yes"
 export CI_SERVER_NAME="GitLab"
 export CI_SERVER_REVISION="8.9.0"