Instructions on how to run localstack as a service

Hi!

Thanks for creating an maintaining this!

When setting up localstack, the action spends around 60 seconds on setup. This seems excessive, and most of the time seems to go to:

• installing python dependencies
• pulling a docker image

but docker actions supports running docker images as services directly. Is this possible? If so, wouldn't that be preferrable?

该 issue 涉及 GitHub Actions workflow、Docker 服务容器以及 Python 依赖项的安装；首先检查 action 当前如何执行这些设置步骤。将这一行为与 GitHub Actions 对 Docker 服务镜像的支持进行比较，并将完成标准定义为：记录或启用一种能够解决已报告启动开销的基于服务的设置。