feat(CLI): envd up a GPU image without GPUs

[gaocegege]

Description

Now we consider the user wants a GPU if cuda is called in build.envd. But we may need to support envd up --no-gpu.

[kenwoodjw]

mean ignore cuda command？

[gaocegege]

No, users build.envd may look like:

def build():
  cuda(xxx)

When the user run envd up, we will use nvidia-container-runtime to launch a GPU container.

This feature is to launch a CPU container with the same build.envd when user run envd up --no-gpu

[kenwoodjw]

maybe like this? https://github.com/tensorchord/envd/blob/main/pkg/app/up.go#L146

var CommandUp = &cli.Command{
+		&cli.BoolFlag{
+			Name: "no-gpu",
+			Usage: "launch same cpu container without gpu",
+			Value: false,
		},
	},

	Action: up,
}

gpu_enable := clicontext.Bool("no-gpu")
var gpu bool
if gpu_enable {
gpu = false
}else {
gpu = builder.GPUEnabled()
}
}

[gaocegege]

LGTM.