CI: GitHub Actions workflow for the Python sample

.github/workflows/python.yml

@@ -0,0 +1,68 @@
+# CI for the Python sample in python/. One workflow per sample implementation:
+# add a sibling workflow (e.g. dotnet.yml) when another language sample lands.
+name: Python sample
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'python/**'
+      - '.github/workflows/python.yml'
+  pull_request:
+    paths:
+      - 'python/**'
+      - '.github/workflows/python.yml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: python-sample-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+defaults:
+  run:
+    working-directory: python
+
+jobs:
+  lint:
+    name: ruff
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-python@v7
+        with:
+          python-version: '3.12'
+          cache: pip
+          cache-dependency-path: python/pyproject.toml
+
+      - name: Install
+        run: pip install -e ".[dev]"
+
+      - name: Lint
+        run: ruff check src tests
+
+  test:
+    name: pytest (${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # pyproject sets requires-python >= 3.11.
+        python-version: ['3.11', '3.12', '3.13']
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-python@v7
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: python/pyproject.toml
+
+      - name: Install
+        run: pip install -e ".[dev]"
+
+      - name: Test
+        run: pytest -v

python/README.md

@@ -1,5 +1,7 @@
 # rowing-data (Python)
 
+[![Python sample](https://github.com/MoveLab-Studio/rowing-data-standard/actions/workflows/python.yml/badge.svg)](https://github.com/MoveLab-Studio/rowing-data-standard/actions/workflows/python.yml)
+
 A **draft** Python implementation of the [Rowing Data Standard](../spec/FIT_STANDARD.md).
 
 This package implements **Draft v0.1**, which is not ratified. Field IDs, scales
@@ -59,3 +61,9 @@ cd python
 pytest
 ruff check src tests
 ```
+
+CI runs exactly these two commands on Python 3.11, 3.12 and 3.13
+([`.github/workflows/python.yml`](../.github/workflows/python.yml)), and only
+when something under `python/` changes. The interop test against the
+`rowingdata` golden FIT file skips on CI, since that file is not in this
+repository.