[Container] PDF generation fails due to crashing chromium

Seemingly, Chromium needs to write to /var/www/ (which does not exist in our Container).
2024-09-04 12:30:12,752 WARNING selenium.webdriver.common.selenium_manager[7]: Cache folder (/var/www/.cache/selenium) cannot be created: Permission denied (os error 13)
2024-09-04 12:30:12,753 WARNING selenium.webdriver.common.selenium_manager[7]: Cache folder (/var/www/.cache/selenium) cannot be created: Permission denied (os error 13)
2024-09-04 12:30:13,297 ERROR celery.app.trace[7]: Task aleksis.core.util.pdf.generate_pdf[d9c7d2eb-b209-4596-a909-28916f4e2194] raised unexpected: SessionNotCreatedException()
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/dist-packages/celery/app/trace.py", line 453, in trace_task
    R = retval = fun(*args, **kwargs)
                 ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/celery/app/trace.py", line 736, in __protected_call__
    return self.run(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/aleksis/core/util/celery_progress.py", line 158, in _inject_recorder
    orig(*args, **kwargs, recorder=recorder)
  File "/usr/local/lib/python3.11/dist-packages/aleksis/core/util/pdf.py", line 68, in generate_pdf
    _generate_pdf_with_chromium(temp_dir, pdf_path, html_url, lang)
  File "/usr/local/lib/python3.11/dist-packages/aleksis/core/util/pdf.py", line 44, in _generate_pdf_with_chromium
    driver = webdriver.Chrome(options=chrome_options)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/selenium/webdriver/chrome/webdriver.py", line 45, in __init__
    super().__init__(
  File "/usr/local/lib/python3.11/dist-packages/selenium/webdriver/chromium/webdriver.py", line 66, in __init__
    super().__init__(command_executor=executor, options=options)
  File "/usr/local/lib/python3.11/dist-packages/selenium/webdriver/remote/webdriver.py", line 212, in __init__
    self.start_session(capabilities)
  File "/usr/local/lib/python3.11/dist-packages/selenium/webdriver/remote/webdriver.py", line 299, in start_session
    response = self.execute(Command.NEW_SESSION, caps)["value"]
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/selenium/webdriver/remote/webdriver.py", line 354, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python3.11/dist-packages/selenium/webdriver/remote/errorhandler.py", line 229, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.SessionNotCreatedException: Message: session not created: Chrome failed to start: exited normally.
  (session not created: DevToolsActivePort file doesn't exist)
  (The process started from chrome location /usr/bin/chromium is no longer running, so ChromeDriver is assuming that Chrome has crashed.)
[Container] PDF generation fails due to crashing chromium

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