Fix coverage upload

Author: D4nte

.github/workflows/build.yml

@@ -58,16 +58,19 @@ jobs:
           make
           make install DESTDIR=../../kcov-build
           cd ../.. && rm -rf kcov-master master.tar.gz
-          ls -R ./kcov-build
-      - name: Upload coverage
+      - name: Generate coverage report
         if: ${{ matrix.coverage }}
         run: |
           for file in target/debug/lightning-*; do
             [ -x "${file}" ] || continue;
             mkdir -p "target/cov/$(basename $file)";
             ./kcov-build/usr/local/bin/kcov --exclude-pattern=/.cargo,/usr/lib --verify "target/cov/$(basename $file)" "$file";
           done
-          bash <(curl -s https://codecov.io/bash)
+      - name: Upload coverage
+        if: ${{ matrix.coverage }}
+      - uses: codecov/codecov-action@v1
+        with:
+          fail_ci_if_error: true
 
   fuzz:
     runs-on: ubuntu-latest