Fix Docker installations, Fix CI env vars

pip can’t be found, python-pip is probably not properly installed

installing docker-compose and docker from Ubuntu repositories now available in Ubuntu 16.04 Xenial!

Image deleted as part of GitLab backup shrinking project. Trying to rebuild the image for jobs which do not define an image to run with

https://forum.duniter.org/t/migration-de-gitlab-doppler-vega/12459/54

• Update .gitlab.yml with latest CI env variables

.gitlab-ci.yml

@@ -14,12 +14,10 @@ build_image:
   services:
   - docker:dind
   script:
-    - docker login -u "gitlab-ci-token" -p "$CI_BUILD_TOKEN" $CI_REGISTRY
-    - docker build --pull -t "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG" .
-    - docker push "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG"
+    - docker login -u "gitlab-ci-token" -p "$CI_JOB_TOKEN" $CI_REGISTRY
+    - docker build --pull -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_TAG" .
+    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_TAG"
   only:
     - tags
   tags:
     - docker
-
-# simple edit to trigger this old pipeline again
\ No newline at end of file