try improve coverage

Author: loongs-zhang

.github/workflows/coverage.yml

@@ -24,16 +24,16 @@ jobs:
       - name: Install toolchain
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: ${{ matrix.channel }}
+          toolchain: 1.81.0
           profile: minimal
           override: true
           components: llvm-tools-preview
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
       - name: Generate code coverage
-        run: bash -c "ulimit -Sl 512 && ulimit -Hl 512 && /home/runner/.cargo/bin/cargo llvm-cov --release --all --lcov --output-path lcov.info"
+        run: bash -c "ulimit -Sl 512 && ulimit -Hl 512 && ${{ matrix.cargo }} llvm-cov --release --all --lcov --output-path lcov.info"
       - name: Generate code coverage with all features
-        run: bash -c "ulimit -Sl 512 && ulimit -Hl 512 && /home/runner/.cargo/bin/cargo llvm-cov --all-features --release --all --lcov --output-path lcov-all-features.info"
+        run: bash -c "ulimit -Sl 512 && ulimit -Hl 512 && ${{ matrix.cargo }} llvm-cov --all-features --release --all --lcov --output-path lcov-all-features.info"
       - name: Upload coverage to Codecov
         run: |
           bash <(curl -s https://codecov.io/bash) -f lcov.info -t ${{ env.CODECOV_TOKEN }}
@@ -42,7 +42,6 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        channel: [ 1.81.0 ]
         include:
           - os: ubuntu-latest
             cargo: /home/runner/.cargo/bin/cargo