Update base image

.gitlab-ci.yml

@@ -20,5 +20,5 @@ build_docker:
     - docker tag ${SHA256} ${TO}
     - docker push ${TO}
   variables:
-    FROM: clelange/cc7-cms # Override the image specified in the Dockerfile
+    FROM: gitlab-registry.cern.ch/clange/cmssw-docker/cc7-cms:latest
     TO: ${CI_REGISTRY_IMAGE}:${CI_COMMIT_SHORT_SHA}

.gitlab/build.sh

 #!/bin/bash
 
-# exit when any command fails, but allow variables not set (no -u); verbose
+# exit when any command fails; be verbose
 set -ex
 
 # make cmsrel etc. work