ci: switch tarpaulin output to lcov format

.github/workflows/build.yaml

@@ -90,7 +90,7 @@ jobs:
         uses: pyodide/setup-emsdk@v15
         with:
           version: 3.1.43
-          actions-cache-folder: "emsdk-cache"
+          actions-cache-folder: "emsdk-cache-b"
 
       - name: Setup Rust (WASM32 Emscripten)
         uses: dtolnay/rust-toolchain@master

.github/workflows/coverage.yaml

@@ -47,12 +47,13 @@ jobs:
       - name: Generate coverage report
         run: |
           cargo tarpaulin \
-            --out Html \
+            --out Lcov \
             --output-dir coverage \
             --rustflags="-C link-arg=-lz"
 
       - name: Upload coverage to Coveralls
         uses: coverallsapp/github-action@v2
         with:
-          files: ./coverage/tarpaulin-report.html
+          files: ./coverage/lcov.info
+          format: lcov
           allow-empty: false