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To bind a file with docker-compose in a runner encapsulated by a GitLab container, you can use the volumes option in your docker-compose.yml file. For example, if you want to bind the host file /path/to/file with the container file /app/file, you can add the following code to your docker-compose.yml file:

version: '3'
services:
  myapp:
    image: myimage
    volumes:
      - /path/to/file:/app/file

This will create a volume that maps the file from the host machine to the container. You can then use the file in your Docker container as you normally would.

To use this docker-compose.yml file in a runner encapsulated by a GitLab container, you need to mount the directory containing the docker-compose.yml file as a volume in the GitLab runner container. You can do this by adding the following code to your GitLab runner configuration:

runners:
  docker:
    image: docker:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /path/to/docker-compose-directory:/app

Replace /path/to/docker-compose-directory with the local directory containing the docker-compose.yml file. This will mount the directory as a volume in the Docker container running the GitLab runner, allowing it to access the docker-compose.yml file.

After this, you can run your GitLab pipeline and the Docker container will use the file bound with docker-compose.yml in the runner encapsulated by the GitLab container.