Plone 6 support

[mauritsvanrees]

This contains commits from @laulaz, @boulch, @gotcha, @sgeulette, @jladage and me.

I only tried fixing bin/test, which fails at startup because of a problem that probably needs to be fixed in collective.celery. O, I just see that might be fixed in this commit. I am currently not interested in fixing Celery-related problems.

Lots of tests still fail locally, but that can also be because I don't have all the required OS level tools installed. I don't know if that has been arranged on GitHub Actions, but let's find out.

And let's have a PR so this work is more visible and other people can more easily help out.

[mauritsvanrees]

There is no GitHub Actions set up at all... Locally I have:

  Ran 32 tests with 12 failures, 7 errors, 0 skipped in 0.386 seconds.

First failure is this:

Failure in test test_auto_convert_powerpoint (collective.documentviewer.tests.test_convert.ConvertTest.test_auto_convert_powerpoint)
Traceback (most recent call last):
  File "/Users/maurits/.pyenv/versions/3.12.10/lib/python3.12/unittest/case.py", line 58, in testPartExecutor
    yield
  File "/Users/maurits/.pyenv/versions/3.12.10/lib/python3.12/unittest/case.py", line 634, in run
    self._callTestMethod(testMethod)
  File "/Users/maurits/.pyenv/versions/3.12.10/lib/python3.12/unittest/case.py", line 589, in _callTestMethod
    if method() is not None:
  File "/Users/maurits/community/collective.documentviewer/collective/documentviewer/tests/test_convert.py", line 54, in test_auto_convert_powerpoint
    self.assertEqual(settings.successfully_converted, True)
  File "/Users/maurits/.pyenv/versions/3.12.10/lib/python3.12/unittest/case.py", line 885, in assertEqual
    assertion_func(first, second, msg=msg)
  File "/Users/maurits/.pyenv/versions/3.12.10/lib/python3.12/unittest/case.py", line 878, in _baseAssertEqual
    raise self.failureException(msg)
AssertionError: False != True

Maybe some of you already have all required OS tools installed and can try it?

[jladage]

@mauritsvanrees on my machine all tests are passing. Thanks!

Ran 32 tests with 0 failures, 0 errors, 0 skipped in 1 minutes 27.256 seconds.
Tearing down left over layers:
Tear down collective.documentviewer.testing.DocumentViewer:Functional in 0.000 seconds.
Tear down collective.documentviewer.testing.DocumentViewer in 0.002 seconds.
Tear down plone.app.testing.layers.PloneFixture in 0.085 seconds.
Tear down plone.testing.zope.Startup in 0.008 seconds.
Tear down plone.testing.zca.LayerCleanup in 0.000 seconds.

[laulaz]

Note for later: this is what we need in the GitHub Action to make tests pass (in addition to the usual steps) :

      - name: Set up Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: '3.4'
      - name: Setup Env
        run: |
          sudo apt-get update -qqy
          sudo apt-get install -qqy libjpeg8-dev libbz2-dev
          sudo apt-get install -qqy graphicsmagick ghostscript pdftk qpdf poppler-utils libreoffice
          sudo gem install docsplit