Update CI workflow

Author: novemberborn

.github/workflows/ci.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     paths-ignore:
     - '*.md'
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
 jobs:
   nodejs:
     name: Node.js
@@ -26,3 +29,4 @@ jobs:
         with:
           files: coverage/lcov.info
           name: ${{ matrix.os }}/${{ matrix.node-version }}
+          token: ${{ secrets.CODECOV_TOKEN }}