try installing apt-utils with wpt install

.gitlab-ci.yml

@@ -52,8 +52,8 @@ build-ubuntu:
     - docker
   stage: build
   script:
-    - apk update ; apk add git apt-utils
-    # - apt install apt-utils
+    - apk update ; apk add git
+    - apt install apt-utils
     # - git checkout master -- requirements.txt
     - docker build --pull -t "$CI_REGISTRY_IMAGE/install-ubuntu" for_build/ubuntu
     - docker push "$CI_REGISTRY_IMAGE/install-ubuntu"