https://github.com/YusukeIwaki/playwright-ruby-client

browserless-playwrite.rb

require "playwright"
uri = "wss://chrome.browserless.io/playwright?token=#{browserless_api_key}"
Playwright.connect_to_playwright_server(uri) do |playwright|
  playwright.chromium.launch do |browser|
    page = browser.new_page
    page.goto("https://github.com/YusukeIwaki")
    page.screenshot(path: "./YusukeIwaki.png")
  end
end

The playwright version could be the issue, make sure you install a supported playwright version, since playwright is tightly version coupled -> https://www.browserless.io/docs/versions