ci(coverage.yml): add GitHub Actions workflow for running tests and collecting coverage reports

docs(README.md): update README to display GitHub Actions workflow status and Codecov badge

Author: SpaceShaman

.github/workflows/coverage.yml

@@ -0,0 +1,33 @@
+name: Run tests
+on: 
+  push:
+    branches:
+      - master
+
+jobs:
+  tests:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.12"
+      - name: Install Poetry
+        uses: abatilo/actions-poetry@v2
+      - name: Setup a local virtual environment
+        run: |
+          poetry config virtualenvs.create true --local
+          poetry config virtualenvs.in-project true --local
+      - uses: actions/cache@v3
+        name: Define a cache for the virtual environment based on the dependencies lock file
+        with:
+          path: ./.venv
+          key: venv-${{ hashFiles('poetry.lock') }}
+      - name: Install dependencies
+        run: poetry install
+      - name: Run tests and collect coverage
+        run: poetry run pytest --cov .
+      - name: Upload coverage raports to Codecov
+        uses: codecov/codecov-action@v4.0.1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}

README.md

@@ -2,3 +2,5 @@
 
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 ![GitHub License](https://img.shields.io/github/license/SpaceShaman/pypi-workflow)
+![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/SpaceShaman/pypi-workflow/tests.yml)
+![Codecov](https://img.shields.io/codecov/c/github/SpaceShaman/pypi-workflow)