I have the following job set up

tests:
        name: Integration tests
        runs-on: ubuntu-latest
    container:
        image: wordpress:5.4.1-php7.2
        env:
            WORDPRESS_DB_HOST: mysql
            WORDPRESS_DB_USER: admin
            WORDPRESS_DB_PASSWORD: ""
            WORDPRESS_DB_NAME: wordpresstest
        ports:
            - 8080:80
        volumes:
            - wordpress:/var/www/html/:rw
        options: --cpus 2

    services:
        mysql:
            image: mysql:5.7
            env:
                MYSQL_ALLOW_EMPTY_PASSWORD: yes
                MYSQL_DATABASE: wordpresstest
            ports:
                - 3306
            options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3

    steps:
        - name: Checkout
          uses: actions/checkout@v2

        - name: PHP setup
          uses: shivammathur/setup-php@v2
          with:
            php-version: 7.2
            coverage: pcov

        - name: Set Node.js version
          uses: actions/setup-node@v1
          with:
            node-version: 14

        - name: Copy .env.testing
          run: yes | cp .env.actions.testing .env.testing

it’s not fully complete because I have two issues here (and I’m probably not understanding things right).

When I get to the last step it fails because none of my hidden files (except .gitattributes and .gitignore) are present in the checkout phase. But when I had wordpress as a service and not a container, everything was checked out correctly. 

Another thing that confuses me is, if I’m in a container (in my case WordPress one), shouldn’t I see all the WordPress files when I do ls -all?

Or are the steps executed on the GH host machine, and the container is started, but the only way to access it would be to exec into it?