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[BUG] Missing a dependency on docker image which fails webkit

See original GitHub issue

Context:

Playwright Version: 0.12.1
Operating System: Mac (but we use the ubuntu docker specified in doc)
Extra: We use docker https://github.com/microsoft/playwright/tree/master/docs/docker to run the screenshot test

Code Snippet

When you running this script in the ubuntu docker

const { webkit } = require('playwright');

(async () => {
  const browser = await webkit.launch({
    dumpio: true,
  });
  const context = await browser.newContext();
  const page = await context.newPage();
  await page.goto('https://google.com');
  await page.screenshot({path: 'screenshot.png'});
  await browser.close();
})();

Describe the bug Seeing:

[err] /home/pwuser/app/node_modules/playwright/.local-browsers/webkit/minibrowser-wpe/MiniBrowser: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory
(node:630) UnhandledPromiseRejectionWarning: Error: Protocol error (Playwright.createContext): Browser has been closed.
    at /home/pwuser/app/node_modules/playwright-core/lib/webkit/wkConnection.js:100:63
    at new Promise (<anonymous>)
    at WKSession.send (/home/pwuser/app/node_modules/playwright-core/lib/webkit/wkConnection.js:99:16)
    at WKBrowser.newContext (/home/pwuser/app/node_modules/playwright-core/lib/webkit/wkBrowser.js:65:65)
    at WKBrowser.<anonymous> (/home/pwuser/app/node_modules/playwright-core/lib/helper.js:84:31)
    at /home/pwuser/app/src/tests/screenshot/specs/test.js:7:33

Basically, it is missing libglu1 for webkit. As long as we added RUN apt-get install -y libglu1, it is working.