title: How to create outputs on GitHub actions from bash scripts?
body: <p>I have a GitHub action that essentially is a bash script. The javascript portion of my action executes a bash script:</p>
  
  <pre><code>const core = require("@actions/core");
  const exec = require("@actions/exec");
  
  async function run() {
    try {
      // Execute bash script
      await exec.exec(`${__dirname}/my-action-script.sh`);
    } catch (error) {
      core.setFailed(error.message);
    }
  }
  
  run();
  </code></pre>
  
  <p>For now, this action will communicate with other actions by leaving files on the file system. This is an "invisible" way of communication and I would like to fill my <code>action.yml</code> with outputs. How can I enable <code>my-action-script.sh</code> to return me outputs defined in my <code>action.yml</code>?</p>