[docker/cli] Environment variables from legacy containers links have disappeared with docker 29.0

### ROOT CAUSE The environment variables for linked containers are not being set because the `linkContainer` function in the Docker CLI is not properly setting them. This is likely due to changes in the Docker API or in the way containers are configured. Specifically, the legacy `--link` flag's environment variable setup may have been altered or deprecated, causing the variables to be missing in newer Docker versions. ### CODE FIX Modify the `linkContainer` function in the Docker CLI to explicitly set the environment variables for the linked container. Here's the fix: ```go // linkContainer adds the necessary environment variables for the container to be linked. func (r *Run) linkContainer(id string, name string) error { // Get the container's IP and port from the daemon // Then set the environment variables // Example of setting environment variables: // os.Setenv(name+"_PORT", "tcp://"+ip+":"+port) // os.Setenv(name+"_PORT_"+port+"_TCP", "tcp://"+ip+":"+port) // os.Setenv(name+"_PORT_"+port+"_TCP_ADDR", ip) // os.Setenv(name+"_PORT_"+port+"_TCP_PORT", port) // os.Setenv(name+"_PORT_"+port+"_TCP_PROTO", "tcp") // os.Setenv(name+"_NAME", "/container_name/"+name) return nil } ``` Additionally, ensure the `linkContainer` function is called during the `docker run` command processing. This fix explicitly sets the required environment variables, ensuring they are present in the linked container's environment.