gigalixir.yml

on:
  pull_request:
    types: [closed]
    branches:
      - master
jobs:
  docker:
    runs-on: ubuntu-latest
    if: github.event.pull_request.merged
    steps:
      - uses: actions/checkout@v1
      - run: sudo pip install gigalixir --ignore-installed six
      - run: gigalixir login -e "${{ secrets.GIGALIXIR_EMAIL }}" -y -p "${{ secrets.GIGALIXIR_PASSWORD }}"
      - run: gigalixir git:remote ${{ secrets.GIGALIXIR_APP_NAME }}
      - run: git push -f gigalixir HEAD:refs/heads/master

Just to be clear, there's no need to url escape your username as mentioned in the docs for gigalixir as in reference to the travis ci example right?

Right. In this case, it's using a cli command to login so nothing needs to be escaped. It would need to be escaped if you used it in a git remote url.