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Showing content from https://help.github.com/en/actions/how-tos/create-and-publish-actions/create-a-cli-action below:

Creating a third party CLI action

Learn how to develop an action to set up a CLI on GitHub Actions runners.

You can write an action to provide a way for users to access your servers via a configured CLI environment on GitHub Actions runners.

Your action should:

Make it simple for users to specify the version of the CLI to install
Support multiple operating systems
Run in an efficient fashion to minimize run-time and associated costs
Work across GitHub-hosted and self-hosted runners
Leverage community tooling when possible

This article will demonstrate how to write an action that retrieves a specific version of your CLI, installs it, adds it to the path, and (optionally) caches it. This type of action (an action that sets up a tool) is often named setup-$TOOL.

Prerequisites

You should have an understanding of how to write a custom action. For more information, see Managing custom actions.

Example

The following script demonstrates how you can get a user-specified version as input, download and extract the specific version of your CLI, then add the CLI to the path.

GitHub provides actions/toolkit, which is a set of packages that helps you create actions. This example uses the actions/core and actions/tool-cache packages.

JavaScript

const core = require('@actions/core');
const tc = require('@actions/tool-cache');

async function setup() {
  // Get version of tool to be installed
  const version = core.getInput('version');

  // Download the specific version of the tool, e.g. as a tarball
  const pathToTarball = await tc.downloadTool(getDownloadURL());

  // Extract the tarball onto the runner
  const pathToCLI = await tc.extractTar(pathToTarball);

  // Expose the tool by adding it to the PATH
  core.addPath(pathToCLI)
}

module.exports = setup

const core = require('@actions/core');
const tc = require('@actions/tool-cache');

async function setup() {
  
  const version = core.getInput('version');

  
  const pathToTarball = await tc.downloadTool(getDownloadURL());

  
  const pathToCLI = await tc.extractTar(pathToTarball);

  
  core.addPath(pathToCLI)
}

module.exports = setup

To use this script, replace getDownloadURL with a function that downloads your CLI. You will also need to create an actions metadata file (action.yml) that accepts a version input and that runs this script. For full details about how to create an action, see Creating a JavaScript action.