What is the process of transforming `docker run -u user1:docker` into docker-compose?

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To transform docker run -u user1:docker into docker-compose:

1. Create a docker-compose.yml file in the root directory of your project.
2. Add a version field at the beginning of the file, specifying the version of docker-compose you are using.
3. Add a services field under which you will define the service you want to run.
4. Under services, add a service name and define its image.
5. Add a user field under the service definition and specify the user and group you want to run the container as.

The final docker-compose file would look something like this:

version: "3"
services:
  my_service:
    image: "my_image"
    user: "user1:docker"

This docker-compose.yml file will create a service named my_service and run it with the user1 user and docker group.