Add CI

.github/workflows/checks.yml

@@ -0,0 +1,54 @@
+name: Checks
+
+on:
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    - cron: '41 16 * * 1'  # Every Monday at 16:41 UTC, to catch breakage from new Rust releases.
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  tests:
+    name: Tests (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Run tests
+        run: cargo test --all-features
+
+  code-quality:
+    name: Code quality (pre-commit hooks)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v10.2.0
+
+      # The tests job already runs cargo test, on every OS.
+      - name: Run pre-commit hooks
+        run: uvx pre-commit run --all-files --show-diff-on-failure
+        env:
+          SKIP: cargo-test