chore: update coverage workflow to simplify and modernize setup (#15)

Revised the GitHub Actions workflow for code coverage by updating
dependencies, using modern, maintained actions, and improving
configuration clarity. Streamlined Rust installation and replaced manual
steps with dedicated actions for better reliability. Adjusted Codecov
settings for stricter error handling.

.github/workflows/coverage.yml

@@ -13,31 +13,24 @@ on:
     types:
       - created
 
+
 jobs:
-  test:
+  coverage:
-    name: coverage
     runs-on: ubuntu-latest
+    env:
+      CARGO_TERM_COLOR: always
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@master
+      - name: Install Rust
-        with:
+        run: |
-          target: x86_64-unknown-linux-gnu
+          rustup update nightly
-          toolchain: nightly
-          components: llvm-tools-preview
-
       - name: Install cargo-llvm-cov
-        run: >
+        uses: taiki-e/install-action@cargo-llvm-cov
-          curl -LsSf 'https://github.com/taiki-e/cargo-llvm-cov/releases/download/v0.5.23/cargo-llvm-cov-x86_64-unknown-linux-musl.tar.gz'
+      - name: Generate code coverage
-          | tar xzf -
+        run: cargo +nightly llvm-cov --all-features --workspace --codecov --doctests --output-path codecov.json
-          && mv cargo-llvm-cov $HOME/.cargo/bin
-
-      - name: Run cargo-llvm-cov
-        run: cargo llvm-cov --doctests --all --all-features --lcov --output-path lcov.info
-
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
         with:
-          directory: ./
+          token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
-          fail_ci_if_error: false
+          files: codecov.json
-          files: ./lcov.info
+          fail_ci_if_error: true
-          verbose: true