Add WIP CI pipeline

.gitlab-ci.yml

+variables:
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+
+stages:
+  - verification
+  - publish_docker
+  - automated_acceptance_testing
+
+unit_testing:
+  stage: verification
+  image: docker.io/python:3-slim
+  script:
+    - cd app
+    - pip install -r requirements.txt
+    - pip install -r tests/requirements.txt
+    - mkdir -p reports
+    - pytest --junitxml=reports/test-report.xml --cov --cov-report term --cov-report xml:reports/test-coverage.xml
+  coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'
+  artifacts:
+    reports:
+        coverage_report:
+          coverage_format: cobertura
+          path: app/reports/test-coverage.xml
+        junit: app/reports/test-report.xml
+  rules:
+    - changes:
+        - app/**
+        - .gitlab-ci.yml
+
+static_analysis:
+  stage: verification
+  image: docker.io/python:3-slim
+  script:
+    - cd app
+    - pip install flake8
+    - flake8 --output-file=reports/static-analysis-flake8.txt --tee main tests
+  artifacts:
+    paths:
+      - app/reports
+  rules:
+    - changes:
+        - app/**
+        - .gitlab-ci.yml
+
+
+publish_docker:
+  stage: publish_docker
+  image:
+    name: gcr.io/kaniko-project/executor:v1.13.0-debug
+    entrypoint: [""]
+  script:
+    - /kaniko/executor
+      --context "${CI_PROJECT_DIR}/app"
+      --build-arg http_proxy=$http_proxy
+      --build-arg https_proxy=$https_proxy
+      --build-arg no_proxy=$no_proxy
+      --dockerfile "${CI_PROJECT_DIR}/app/Dockerfile"
+      --destination "${CI_REGISTRY_IMAGE}:${CI_PIPELINE_IID}"
+      --destination "${CI_REGISTRY_IMAGE}:latest"
+  rules:
+    - changes:
+        - app/**
+        - .gitlab-ci.yml
+
+
+# automated_acceptance_testing:
+#   stage: automated_acceptance_testing
+#   image: docker.io/python:3-slim
+#   services:
+#     - name: docker.io/selenium/standalone-firefox:latest
+#       alias: selenium
+#     - name: "${CI_REGISTRY_IMAGE}:${CI_PIPELINE_IID}"
+#     - name: 
+#   variables:
+#     ACCEPTATION_DEPLOYMENT_URL: http://127.0.0.1:5000
+#     REMOTE_DRIVER_HOST: selenium
+#   script:
+#     - cd acceptance
+#     - pip install .
+#     - pytest --verbosity=10
+
+# TODO :
+# - deploy_testing
+# - deploy_staging
+# - deploy_production
+# make a proper software release + release notes?
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