Inject values in a dagger do run

plan.cue

package main

import (
	"dagger.io/dagger"

	"universe.dagger.io/bash"
	"universe.dagger.io/docker"
)

dagger.#Plan & {

	actions: {
		params: {
			myval: string
		}

		_pull: docker.#Pull & {
			source: "index.docker.io/debian"
		}
		_image: _pull.output

		exec: bash.#Run & {
			input: _image
			script: contents: """
		echo \(params.myval)
		echo done
		"""
		}
	}
}

run.sh

dagger do exec --with 'actions: params: myval: "Hello World"'