apply.sh

scriptPath="$(readlink -f "$(dirname "$0")")"
cd /opt/gitlab/embedded/service/gitlab-rails/public/assets/webpack
echo >> main.*.js
echo "$scriptPath/"*.js
cat "$scriptPath/"*.js >> main.*.js
gzip -c main.*.js > main.*.js.gz

github-desktop.js

const initGithubDesktop=(function() {
    'use strict';

    const targetElem = document.evaluate("//label[contains(text(),'Open in your IDE')]", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
    if (targetElem == null) {
      //setTimeout(initGithubDesktop, 200);
      return;
    }

    const label='GitHub Desktop'
    const html = `<a class="dropdown-item open-with-link"><div class="gl-dropdown-item-text-wrapper">${label}</div></a>`
    const elem = new DOMParser().parseFromString(html, 'text/html').body.children[0];
    elem.href = "x-github-client://openRepo/" + document.getElementById('http_project_clone').value.replace(/\.git$/, "");
    targetElem.parentNode.appendChild(elem);
})

window.addEventListener("load", initGithubDesktop);

json-editor.js

const initJsonEditor=(function() {
    'use strict';

    const targetElem = document.querySelector('.tree-controls>div>*:nth-child(3)');
    if (targetElem == null) {
      //setTimeout(initJsonEditor, 200);
      return;
    }

    const label='JSON Editor'
    const html = `<a class="gl-button btn btn-default shortcuts-find-file" rel="nofollow">${label}</a>`
    const elem = new DOMParser().parseFromString(html, 'text/html').body.children[0];
    const url = new URL('https://git-json-editor.de/')
    url.searchParams.set('url', document.getElementById('http_project_clone').value)
    const branch = document.querySelector('.tree-ref-holder .gl-dropdown-button-text')?.textContent;
    if (branch != null) {
      url.searchParams.set('branch', branch);
    }
    elem.href = url.href;
    targetElem.parentNode.insertBefore(elem, targetElem);
})

window.addEventListener("load", initJsonEditor);