gitlab-ciの設定を追加

.gitlab-ci.yml

+image: python:3.8-slim
+
+stages:
+  - test
+
+before_script:
+  - pip install poetry
+  - poetry config virtualenvs.create false
+
+test_project_a:
+  stage: test
+  before_script:
+    - cd project_a
+    - poetry install
+  script:
+    - echo "Running tests"
+    - poetry run pytest tests
+
+test_project_b:
+  stage: test
+  before_script:
+    - cd project_b
+    - poetry install
+  script:
+    - echo "Running tests"
+    - poetry run pytest tests
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