all pipeline: Use ci-scripts fetch refspec which includes refs/changes/*

Consistently use extended fetch pattern, to be able to directly test
tf-m-ci-scripts patches submitted to Gerrit.

Addresses https://linaro.atlassian.net/browse/TFC-639

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I64be38d6dcd122ee7a508d7d15c73395d5949d9b
diff --git a/tf-m-build-docs-nightly.yaml b/tf-m-build-docs-nightly.yaml
index 5c005eb..86872e8 100644
--- a/tf-m-build-docs-nightly.yaml
+++ b/tf-m-build-docs-nightly.yaml
@@ -68,6 +68,7 @@
             url: '$CI_SCRIPTS_REPO'
             branches:
             - '$CI_SCRIPTS_BRANCH'
+            refspec: '+refs/heads/*:refs/remotes/origin/* +refs/changes/*:refs/remotes/origin/refs/changes/*'
             credentials-id: GIT_SSH_KEY
             wipe-workspace: false
       script-path: jenkins/build-docs.jpl