chore(actions): add coverage and use cargo miri nextest run

.github/workflows/ci.yaml

@@ -67,7 +67,9 @@ jobs:
           rustup toolchain install nightly --component miri
           rustup override set nightly
           cargo miri setup
+      - name: Install latest nextest release
+        uses: taiki-e/install-action@nextest
       - name: Rust Cache
         uses: Swatinem/[email protected]
       - name: Test with Miri
-        run: cargo miri test
+        run: cargo miri nextest run

.github/workflows/coverage.yml

@@ -0,0 +1,30 @@
+name: Coverage
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  build_rust:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: llvm-tools-preview
+      - uses: Swatinem/rust-cache@v2
+      - name: Install latest nextest release
+        uses: taiki-e/install-action@nextest
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+      - name: Collect coverage data
+        run: cargo llvm-cov nextest --codecov --output-path codecov.json
+      - name: Upload coverage reports to Codecov
+        uses: codecov/[email protected]
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: codecov.json
+          slug: jbr/stopper