workflows: run tests in container

Author: shtrom

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/setup-python@v6
-      - run: pip install -r requirements-dev.txt
-      - run: pip install .
-      - run: pytest
+      - run: docker build -f docker/Dockerfile -t reviewer-selector .
+      - run: >
+          docker run --entrypoint bash reviewer-selector
+          -c 'pip install -r requirements-dev.txt && pytest'