ci: use codecov for coverage

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

.github/workflows/coverage.yml

@@ -1,22 +1,43 @@
 name: coverage
 
-on:                             [ "push" , "pull_request" ]
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the master branch
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  release:
+    types:
+      - created
+
 jobs:
   test:
     name: coverage
     runs-on: ubuntu-latest
-    container:
-      image:                    xd009642/tarpaulin
-      options:                  --security-opt seccomp=unconfined
     steps:
-      - name:                   Checkout repository
+      - uses: actions/checkout@v1
-        uses:                   actions/checkout@v2
+      - uses: dtolnay/rust-toolchain@master
-
-      - name:                   Generate code coverage
-        run: |
-          cargo tarpaulin --verbose --workspace --timeout 120 --out Lcov --output-dir coverage
-
-      - name:                   Upload to coveralls
-        uses: coverallsapp/github-action@master
         with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          target: x86_64-unknown-linux-gnu
+          toolchain: nightly
+          components: llvm-tools-preview
+
+      - 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
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          directory: ./
+          fail_ci_if_error: false
+          files: ./lcov.info
+          verbose: true