message: e2e-test: work around yarn refusing install in CI
diff: @@ -50,6 +50,9 @@ export async function run() {
  print('Building dist workspace');
  const workspaceDir = await buildDistWorkspace('workspace', rootDir);
  + // Otherwise yarn will refuse to install with CI=true
  + process.env.YARN_ENABLE_IMMUTABLE_INSTALLS = 'false';
  +
  print('Creating a Backstage App');
  const appDir = await createApp('test-app', workspaceDir, rootDir);
  