Github Action for Docker Runtime

Does anyone know how to use a Github action to deploy a Vapor application when pushing a new commit? I had it configured correctly when I was using one of the native runtimes. I had to switch to a Docker runtime because I needed a specific PHP extension. Now my commits are no longer deployed. My old action looked like:

name: Deploy to Staging

on:
  push:
    branches: [ staging ]

jobs:
  vapor:
    name: Check out and deploy using Vapor
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - name: Login to Github Package Registry
      run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin
    - name: Deploy to Staging
      run: |
        docker run \
          --env VAPOR_API_TOKEN=${{ secrets.VAPOR_API_TOKEN }} \
          --volume $(pwd):/app \
          docker.pkg.github.com/ubient/laravel-vapor-action/laravel-vapor-action:latest \
          deploy staging

Thanks!