feat: introduce CI/CD with tests

Using a custom base image installed on the runner, the installation and tests should work (fast).

ref: N25B-367

.gitlab-ci.yml

@@ -0,0 +1,38 @@
+# ---------- GLOBAL SETUP ---------- #
+workflow:
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+
+stages:
+  - install
+  - test
+
+default:
+  image: qi-py-ri-base:latest
+  cache:
+    key: "${CI_COMMIT_REF_SLUG}"
+    paths:
+      - .venv/
+    policy: pull-push
+
+# --------- INSTALLING --------- #
+install:
+  stage: install
+  tags:
+    - install
+  script:
+    - pip install -r requirements.txt
+  artifacts:
+    paths:
+      - .venv/
+    expire_in: 1h
+
+# ---------- TESTING ---------- #
+test:
+  stage: test
+  needs:
+    - install
+  tags:
+    - test
+  script:
+    - PYTHONPATH=${PYTHONPATH}:src pytest test/