free disk space and add codecov token

.github/workflows/codecov-coverage.yml

@@ -12,12 +12,42 @@ on:
 jobs:
   coverage:
     runs-on: ubuntu-latest
-    name: ubuntu / stable / coverage
+    name: Code Coverage
     steps:
+      # The build artifacts generated by Polkadot projects are already large
+      # and even larger when using llvm-cov. This step removes some of the larger and unused files
+      - name: Free disk space
+        run: |
+          echo "Freeing up disk space..."
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /opt/ghc
+          sudo rm -rf "/usr/local/share/boost"
+          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+          sudo apt-get clean
+          docker rmi $(docker image ls -aq)
+          df -h
+
       - uses: actions/checkout@v4
         with:
           submodules: true
 
+      - name: Cache cargo registry & git sources
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/
+            ~/.cargo/git/db/
+          key: ${{ runner.os }}-cargo-unittest-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-unittest-${{ hashFiles('**/Cargo.lock') }}
+            ${{ runner.os }}-cargo-unittest-
+            ${{ runner.os }}-cargo-
+
+      - name: Run sccache
+        uses: mozilla-actions/[email protected]
+
       - name: Install stable
         uses: dtolnay/rust-toolchain@stable
         with:
@@ -29,12 +59,14 @@ jobs:
       - name: Install protoc
         uses: arduino/setup-protoc@v3
 
-      - name: cargo generate-lockfile
+      - name: Generate lockfile if it doesn't exist
         if: hashFiles('Cargo.lock') == ''
         run: cargo generate-lockfile
 
       - name: cargo llvm-cov
-        run: cargo llvm-cov --locked --lcov --output-path lcov.info
+        # Follow the test command in `coverage.yml`
+        # but without release mode to avoid long build times
+        run: cargo llvm-cov nextest --workspace --features=evm-tracing --lcov --output-path lcov.info
 
       - name: Record Rust version
         run: echo "RUST=$(rustc --version)" >> "$GITHUB_ENV"
@@ -44,3 +76,4 @@ jobs:
         with:
           fail_ci_if_error: true
           env_vars: OS,RUST
+          token: ${{ secrets.CODECOV_TOKEN }}