Aggregate various coverage-summary files into one report

[vhoyer]

    - name: Comment Test Coverage
      uses: AthleticNet/comment-test-coverage@master
      with:
        title: Test Coverage
        token: ${{ secrets.GITHUB_TOKEN }}
        path:
          - packages/pkg1/coverage/coverage-summary.json
          - packages/pkg2/coverage/coverage-summary.json
          - packages/pkg3/coverage/coverage-summary.json

or even better

    - name: Comment Test Coverage
      uses: AthleticNet/comment-test-coverage@master
      with:
        title: Test Coverage
        token: ${{ secrets.GITHUB_TOKEN }}
        path: packages/*/coverage/coverage-summary.json

[vhoyer]

https://www.npmjs.com/package/lcov-result-merger