Added GitHub Actions workflow for Python tests and Codecov integration

- Introduced `.github/workflows/python.yml` to run tests on main branch pushes and PRs
- Enabled test matrix for Python 3.10, 3.11, 3.12, and 3.13
- Configured test coverage reporting with Codecov
- Updated README with GitHub Actions and Codecov badges

Author: starichkov

.github/workflows/python.yml

@@ -0,0 +1,51 @@
+name: Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: [ "3.10", "3.11", "3.12", "3.13" ]
+
+    env:
+      COVERAGE_PROCESS_START: ${{ github.workspace }}/.coveragerc
+      TESTCONTAINERS_RYUK_DISABLED: true
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m venv .venv
+          source .venv/bin/activate
+          pip install -r requirements.txt
+          pip install -r requirements-dev.txt
+
+      - name: Check Docker is available
+        run: docker ps
+
+      - name: Run tests with coverage
+        run: |
+          source .venv/bin/activate
+          pytest --cov=producer --cov=consumer --cov-report=xml
+
+      # Only upload coverage from the main Python version (3.12)
+      - name: Upload coverage to Codecov (only on Python 3.12)
+        if: matrix.python-version == '3.12'
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.xml
+          fail_ci_if_error: true

README.md

@@ -1,4 +1,6 @@
 [![Author](https://img.shields.io/badge/Author-Vadim%20Starichkov-blue?style=for-the-badge)](https://github.com/starichkov)
+[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/starichkov/kafka-python-demo/python.yml?style=for-the-badge)](https://github.com/starichkov/kafka-python-demo/actions/workflows/python.yml)
+[![Codecov](https://img.shields.io/codecov/c/github/starichkov/kafka-python-demo?style=for-the-badge)](https://codecov.io/gh/starichkov/kafka-python-demo)
 [![GitHub License](https://img.shields.io/github/license/starichkov/kafka-python-demo?style=for-the-badge)](https://github.com/starichkov/kafka-python-demo/blob/main/LICENSE.md)
 
 # Apache Kafka Python Demo