Use docker image in CI

.dockerignore

+*
+!pyproject.toml

.gitlab-ci.yml

-image: boileaum/jupyter
-
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
 
 stages:
+  - deps
   - test
   - deploy
 
-before_script:
-    - curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python
-    - source $HOME/.poetry/env
+deps:
+  stage: deps
+  tags:
+    - shell
+  script:
+    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+    - docker info
+    - echo "Building $CI_REGISTRY_IMAGE"
+    - DOCKER_BUILDKIT=1 docker build --pull -t $CI_REGISTRY_IMAGE -f Dockerfile .
+    - docker push $CI_REGISTRY_IMAGE
 
 test:
   stage: test
+  image: $CI_REGISTRY_IMAGE
   tags:
     - docker
   script:
@@ -21,6 +28,7 @@ test:
 
 deploy:
   stage: deploy
+  image: $CI_REGISTRY_IMAGE
   tags:
     - docker
   script:

Dockerfile

+FROM boileaum/jupyter
+
+# From Jupyter Project <jupyter@googlegroups.com>
+
+LABEL maintainer="Matthieu Boileau <matthieu.boileau@math.unistra.fr>"
+
+COPY pyproject.toml .
+RUN curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python
+ENV PATH="$HOME/.poetry/bin:$PATH"
+RUN poetry install
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