Add ci.yml to run ruff format/check & tests on a python matrix

Author: jacobcolyvan

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+  workflow_dispatch:
+
+jobs:
+  tests-and-linting:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+          cache-dependency-path: '**/pyproject.toml'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install .[testing,dev]
+
+      - name: Check Python linting (Ruff)
+        run: ruff check --output-format=github
+
+      - name: Check Python formatting (Ruff)
+        run: ruff format --check
+
+      - name: Run tests
+        run: python runtests.py

README.md

@@ -210,9 +210,10 @@ python runtests.py
 ```
 
 
-### Formatting
+### Linting and formatting
 
-```
+```bash
 pip install -r requirements.txt
-black .
-```
+ruff check
+ruff format
+```