Fix builders.sh

Change-Id: I386567b8a8a9233a5381193e8fd9cbca3969032b
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 5c3570c..c2b9695 100644
--- a/ci-dockerfiles-deployment/container-build.jpl
+++ b/ci-dockerfiles-deployment/container-build.jpl
@@ -39,14 +39,15 @@
                 container('buildah') {
                     checkout scm
 
-                    sh """
+
+                    sh '''
                       env
-                      export PROJECT="dockerfiles"
-                      git clone https://${env.GERRIT_HOST}/${env.GERRIT_PROJECT} ${env.PROJECT}
-                      cd ${env.PROJECT}
+                      PROJECT="dockerfiles"
+                      git clone https://$GERRIT_HOST/${GERRIT_PROJECT} $PROJECT
+                      cd ${PROJECT}
                       git fetch origin ${env.GERRIT_REFSPEC}
                       git checkout FETCH_HEAD
-                    """
+                    '''
 
                     sh "env"
                     sh "ci-dockerfiles-deployment/build-version.sh"