ci: test out CI pipeline

.github/workflows/python-app.yml

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+name: Python application
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.10"
+    - name: Install poetry
+      run: |
+        python -m pip install poetry
+    - name: Configure poetry
+      run: |
+        poetry config virtualenvs.in-project true
+    - name: Cache the virtualenv
+      uses: actions/cache@v2
+      with:
+        path: ./.venv
+        key: ${{ runner.os }}-venv-${{ hashFiles('**/poetry.lock') }}
+    - name: Install dependencies
+      run: |
+        poetry install
+    - name: Lint with ruff
+      run: |
+        poetry run ruff .
+    - name: Run tests
+      run: |
+        poetry run pytest

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/python-poetry/poetry
+    rev: '1.7.1'
+    hooks:
+      - id: poetry-check
+  - repo: local
+    hooks:
+      - id: black
+        name: black
+        entry: poetry run black
+        language: system
+        types: [python]
+      - id: ruff
+        name: ruff
+        entry: poetry run ruff . --fix
+        language: system
+        types: [python]

tests/test_hello_world.py

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+from unittest import TestCase
+
+
+class TestHelloWorld(TestCase):
+    def test_upper(self):
+        self.assertEqual("hello world!".upper(), "HELLO WORLD!")