Move pytest dependency to extras

.gitlab-ci.yml

@@ -7,8 +7,7 @@ tests:
   stage: tests
   before_script:
     - apt update && apt install -y python3-pip
-    - pip install pytest
-    - pip install .
+    - pip install .[test]
   script:
     - pytest tests/
   tags:

setup.cfg

@@ -13,3 +13,6 @@ install_requires=
 
 [options.packages.find]
 where = package
+
+[options.extras_require]
+test = pytest==7.1.2