chore: update coverage workflow to simplify and modernize setup

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.

Signed-off-by: Harald Hoyer <harald@hoyer.xyz>

.github/workflows/coverage.yml

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