Add gitlab-ci pipeline

.gitlab-ci.yml

+image: 'tmaier/docker-compose:latest'
+variables:
+    PYTHON_BASE_IMAGE: 'python:3.8.4-slim'
+
+stages:
+    - test
+    - build
+
+pytest:
+    image: $PYTHON_BASE_IMAGE
+    stage: test
+    script:
+        - 'python -m pip install --upgrade pip'
+        - 'python -m pip install -r requirements.txt'
+        - 'python -m pip install pytest'
+        - 'python -m pytest test'
+
+extract_data:
+    image: $PYTHON_BASE_IMAGE
+    stage: build
+    script:
+        - 'python -m pip install --upgrade pip'
+        - 'python -m pip install -r requirements.txt'
+        - 'python -m pip install ipython'
+        - 'ipython travelogues_extraction/script/script.py'
+    artifacts:
+        paths:
+            - 'travelogues_extraction/script/output/'