How can I migrate from sbt-coveralls to GitHub Actions?

Question

I've been using Travis with sbt-scoverage + sbt-coveralls and now want to try Github Actions.

I've been able to do my coverage in my Action but the GitHub Action for Coveralls.io fails because no lcov.info file is generated. I'm not aware that scoverage generates lcov.info (does it?).

Has anyone been successful using GitHub Actions with sbt + coverage + coveralls?

Here's my action script:

name: My Scala CI

on: ["push", "pull_request"]

jobs:
  build:
    name: My CI
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1
      with:
        fetch-depth: 1
    - name: Set up JDK 13
      uses: actions/setup-java@v1
      with:
        java-version: '13.0.1'
    - name: Run tests
      uses: lokkju/github-action-sbt@master
      with:
        commands: '+ test'
    - name: Generate coverage report (1 of 5 - clean)
      uses: lokkju/github-action-sbt@master
      with:
        commands: 'clean'
    - name: Generate coverage report (2 of 5 - coverage)
      uses: lokkju/github-action-sbt@master
      with:
        commands: 'coverage'
    - name: Generate coverage report (3 of 5 - test)
      uses: lokkju/github-action-sbt@master
      with:
        commands: 'test'
    - name: Generate coverage report (4 of 5 - coverageAggregate)
      uses: lokkju/github-action-sbt@master
      with:
        commands: 'coverageAggregate'
    - name: Coveralls
      uses: coverallsapp/github-action@master
      with:
        github-token: ${{ secrets.COVERALLS }}