debug(CI): test image pull

.gitlab-ci.yml

@@ -6,6 +6,7 @@ default:
   image: "quay.io/buildah/stable"
   before_script:
     - buildah login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    - buildah pull $BASE
     - source environment
     - >
         buildah bud