GitHub Actions inputs to textareas userscript. Enables multiline inputs to workflows. Install link (requires Grease/Tamper/Violentmonkey browser extension): https://gist.githubusercontent.com/plu5/dbbe0c3ba407c1e8ed432342edcd70e8/raw/ghtextareas.user.js

ghtextareas.user.js

// ==UserScript==
// @name        ghactions inputs to textareas
// @namespace   Violentmonkey Scripts
// @version     1.0.0
// @match       https://github.com/*/actions/workflows/*
// @grant       unsafeWindow
// @author      plu5
// @description Converts inputs to textareas to enable multiline
// @homepageURL https://gist.github.com/plu5/dbbe0c3ba407c1e8ed432342edcd70e8
// @updateURL   https://gist.githubusercontent.com/plu5/dbbe0c3ba407c1e8ed432342edcd70e8/raw/ghtextareas.user.js
// @downloadURL https://gist.githubusercontent.com/plu5/dbbe0c3ba407c1e8ed432342edcd70e8/raw/ghtextareas.user.js
// ==/UserScript==
(function() {
  const mutationHappened = () => {
    document.querySelectorAll('input').forEach(input => {
      if (/^input_\d+$/.test(input.id)) {
        const textarea = document.createElement('textarea');
        for (const attr of input.attributes) {
          textarea.setAttribute(attr.name, attr.value);
        }
        textarea.value = input.value;
        input.replaceWith(textarea);
      }
    });
  };

  const observer = new MutationObserver(mutationHappened);
  observer.observe(document.documentElement, {
    childList: true,
    subtree: true
  });

  mutationHappened();
})();