ci: add code coverage

.github/actions/init/action.yml

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+name: Initialize
+description: This action initializes a runner for use in other actions.
+inputs:
+  cache-key:
+    description: "The key to be used for the cache"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Setup Ubuntu dependencies
+      shell: bash
+      run: sudo apt update && sudo apt install -y protobuf-compiler
+
+    - name: Free up space on runner
+      shell: bash
+      run: |
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /opt/ghc
+        sudo rm -rf "/usr/local/share/boost"
+        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+
+    - name: Rust Cache
+      uses: Swatinem/[email protected]
+      with:
+        cache-on-failure: true
+        cache-all-crates: true
+        key: ${{ inputs.cache-key }}

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    types: [ opened, synchronize, reopened, ready_for_review ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check formatting
+        run: cargo +stable fmt --all -- --check
+
+  check:
+    needs: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: "./.github/actions/init"
+
+      - name: Check Build
+        run: |
+          cargo check --release --locked --features=runtime-benchmarks
+
+  clippy:
+    needs: lint
+    runs-on: ubuntu-latest
+    permissions:
+      checks: write
+    env:
+      SKIP_WASM_BUILD: 1
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: "./.github/actions/init"
+
+      - name: Annotate with Clippy warnings
+        uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --release --locked --features=runtime-benchmarks
+
+  test:
+    needs: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: "./.github/actions/init"
+
+      - name: Run tests
+        run: cargo test --release --locked --verbose --all
+
+      - name: Check try-runtime build
+        run: cargo check --release --features=try-runtime
+
+  coverage:
+    needs: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: "./.github/actions/init"
+
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+
+      - name: Generate code coverage
+        run: cargo llvm-cov --all-features --workspace --lib --bins --codecov --output-path codecov.json
+
+      - name: Upload to codecov.io
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: codecov.json
+          fail_ci_if_error: true

codecov.yml

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+# https://docs.codecov.com/docs/common-recipe-list
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 0%
+comment:
+  layout: " diff, flags, files"
+  behavior: default
+  require_changes: false
+  require_base: false
+  require_head: true
+  hide_project_coverage: false