Improve subsetter

.github/workflows/ci.yml

@@ -2,10 +2,31 @@ name: Continuous integration
 on: [push, pull_request]
 
 jobs:
-  ci:
+  tests:
+    name: Tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install fonttools
+        run: pip install fonttools==4.50
       - uses: dtolnay/rust-toolchain@stable
       - run: cargo build --release
+        name: Build
       - run: cargo test --release
+        name: Run tests
+
+  checks:
+    name: Check clippy, formatting, and documentation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - uses: taiki-e/install-action@cargo-hack
+      - run: cargo clippy
+      - run: cargo fmt --check --all
+      - run: cargo doc --workspace --no-deps

.gitignore

@@ -7,4 +7,10 @@ desktop.ini
 # Rust
 /target
 bench/target
-Cargo.lock
+debug
+.idea
+
+# Tests
+tests/subsets
+tests/ttx/*.otf
+tests/ttx/*_ref.ttx