Restore shellcheck for scripts/*sh

.gitlab-ci.yml

+shellcheck:
+  image: tecnalia-docker-dev.artifact.tecnalia.com/koalaman/shellcheck-alpine
+  script: scripts/*sh
+  tags:
+    - docker
+
 yamllint:
   image: tecnalia-docker-dev.artifact.tecnalia.com/sdesbure/yamllint
   script: yamllint $(find . -name '*.yml' -o -name '*.yaml')