Add GitHub Actions test suite

Author: sethmlarson

.github/workflows/tests.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on: [push, pull_request, workflow_dispatch]
+
+permissions:
+  contents: "read"
+
+defaults:
+  run:
+    shell: bash
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        os: ["ubuntu-24.04"]
+        include:
+          # Homebrew
+          - python-version: "3.14"
+            os: "macos-15"
+
+    runs-on: ${{ matrix.os }}
+    name: ${{ fromJson('{"macos-15":"macOS","windows-latest":"Windows","ubuntu-24.04":"Ubuntu"}')[matrix.os] }} ${{ matrix.python-version }}
+    timeout-minutes: 10
+    steps:
+      - name: "Checkout repository"
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+
+      - name: "Setup Python ${{ matrix.python-version }}"
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
+          check-latest: true
+
+      - name: "Run tests"
+        run: |
+          python -m pip install nox
+          nox -s "tests-${{ matrix.python-version }}"