[Docker/package] use prometheus cube and activate some metrics

.gitlab-ci.yml

-image: python:3.7
+default:
+  image: python:3.7
 
 include:
   - project: "open-source/gitlab-ci-templates"
     ref: "branch/default"
     file:                                           # the stages are:
       - "templates/no-duplicated-ci-pipelines.yml"  # no stage
+      - "templates/lint/black.yml"
+      - "templates/lint/flake8.yml"
+      - "templates/lint/check-manifest.yml"
+      - "templates/lint/yamllint.yml"
+      - "templates/lint/mypy.yml"
+      - "templates/tests/py3.yml"
       - "templates/build-docker-image.yml"          # test and publish
       - "templates/create-release-on-heptapod.yml"  # release
       - "templates/upload-to-pypi.yml"              # release
 
 stages:
-  - test
+  - lint
+  - tests
   - release
   - publish
   - deploy
 
-.test:
-  stage: test
-  before_script:
-    - pip install tox
-
-check-manifest:
-  extends: .test
-  script: tox -e check-manifest
-
-flake8:
-  extends: .test
-  rules:
-    - changes:
-        - "**/*.py"
-  script: tox -e flake8
-
-py3:
-  extends: .test
-  script: tox -e py3
-  rules:
-    - changes:
-        - "**/*.py"
-  artifacts:
-    paths:
-      - py3-deprecated-warnings.json
-
-black:
-  stage: test
-  rules:
-    - changes:
-        - "**/*.py"
-  script: tox -e black
-
-mypy:
-  stage: test
-  rules:
-    - changes:
-        - "**/*.py"
-  script: tox -e mypy
-
-
-yamllint:
-  extends: .test
-  rules:
-    - changes:
-        - "**/*.yaml"
-        - "*.yaml"
-        - "**/*.yml"
-        - "*.yml"
-  script:
-    - tox -e yamllint
-
 deploy:
   image:
     name: registry.logilab.fr/logilab/infra/dockerfiles/kubectl