add coverage to GH actions workflow

.github/workflows/checks.yml

@@ -0,0 +1,64 @@
+name: Code checks
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: clippy
+      - name: Lint
+        run: cargo clippy --lib -- -D warnings
+
+  format:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: rustfmt
+      - name: Format
+        run: cargo fmt --all -- --check
+
+  test_and_coverage:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup rust toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: llvm-tools-preview
+          toolchain: stable
+
+      - name: Install llvm-cov
+        env:
+          LLVM_COV_RELEASES: https://github.com/taiki-e/cargo-llvm-cov/releases
+        run: |
+          host=$(rustc -Vv | grep host | sed 's/host: //')
+          curl -fsSL $LLVM_COV_RELEASES/latest/download/cargo-llvm-cov-$host.tar.gz | tar xzf - -C "$HOME/.cargo/bin"
+
+      - name: Generate coverage report
+        run: cargo llvm-cov --lcov --output-path coverage.lcov
+
+      - name: Upload coverage report
+        uses: codecov/codecov-action@v4
+        with:
+          fail_ci_if_error: true
+          file: coverage.lcov
+          flags: rust
+          token: ${{ secrets.CODECOV_TOKEN }}