Fix builders.sh

Change-Id: If803504797e351fb1720d4cbf1b1dc374e864405
Signed-off-by: Saheer Babu <saheer.babu@arm.com>
diff --git a/ci-dockerfiles-deployment/container-build.jpl b/ci-dockerfiles-deployment/container-build.jpl
index 1f3f319..7539075 100644
--- a/ci-dockerfiles-deployment/container-build.jpl
+++ b/ci-dockerfiles-deployment/container-build.jpl
@@ -38,6 +38,14 @@
             steps {
                 container('buildah') {
                     checkout scm
+                    sh """
+                      PROJECT="dockerfiles"
+                      git clone https://${GERRIT_HOST}/${GERRIT_PROJECT} ${PROJECT}
+                      cd ${PROJECT}
+                      git fetch origin $GERRIT_REFSPEC
+                      git checkout FETCH_HEAD
+                    """
+
                     sh "env"
                     sh "ci-dockerfiles-deployment/build-version.sh"
                     sh "ci-dockerfiles-deployment/builders.sh"