ci: Replace code coverage

Measure test coverage using `cargo-llvm-cov`.

Signed-off-by: Manabu Sugimoto <Manabu.Sugimoto@sony.com>

.github/workflows/build-test.yaml

@@ -181,21 +181,22 @@ jobs:
       - name: Verify that the libseccomp crate version is up to date in README
         run: grep -q "$(sed -n 's/^version = \(.*\)/libseccomp = \1/p' libseccomp/Cargo.toml)" README.md
 
-#  coverage:
-#    name: Code Coverage
-#    runs-on: ubuntu-latest
-#    strategy:
-#      matrix:
-#        features:
-#          - all-features
-#    steps:
-#      - name: Checkout
-#        uses: actions/checkout@v3
-#      - name: Install upstream libseccomp
-#        run: sudo ./scripts/install_libseccomp.sh
-#      - name: Run cargo tarpaulin
-#        uses: actions-rs/tarpaulin@v0.1
-#        with:
-#          args: '--${{ matrix.features }} -- --test-threads 1'
-#      - name: Upload to codecov.io
-#        uses: codecov/codecov-action@v3
+  coverage:
+    name: Code Coverage
+    runs-on: ubuntu-latest
+    env:
+      CARGO_TERM_COLOR: always
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+      - name: Install upstream libseccomp
+        run: sudo ./scripts/install_libseccomp.sh
+      - name: Generate code coverage
+        run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info -- --test-threads 1
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          files: lcov.info
+          fail_ci_if_error: true