Linux Github Action does not work.

[bleykauf]

I believe that it is caused by a failed installation of PyQt5.

Added additional job to install some dependencies via apt-get: https://github.com/linien-org/linien/commit/de7eb65c18ddc86bf49d83611e2150e44f0f668f

Tried updating pip https://github.com/linien-org/linien/commit/13279d17195da93ea835eb8482ab4febd07c3314 but according to output of Pyinstaller job, latest version is already being installed, so removed again https://github.com/linien-org/linien/commit/f5838b88afea1be0a64d29e68bfb78551888b0aa.

The relevent output of the pyinstaller job:

Collecting PyQt5==5.15.0
  Downloading PyQt5-5.15.0.tar.gz (3.3 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 3.3/3.3 MB 78.6 MB/s eta 0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
  Preparing metadata (pyproject.toml): started
  Preparing metadata (pyproject.toml): finished with status 'error'
  error: subprocess-exited-with-error
  
  × Preparing metadata (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [29 lines of output]
      Traceback (most recent call last):
        File "/root/.pyenv/versions/3.7.5/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 156, in prepare_metadata_for_build_wheel
          hook = backend.prepare_metadata_for_build_wheel
      AttributeError: module 'sipbuild.api' has no attribute 'prepare_metadata_for_build_wheel'
      
      During handling of the above exception, another exception occurred:
      
      Traceback (most recent call last):
        File "/root/.pyenv/versions/3.7.5/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 363, in <module>
          main()
        File "/root/.pyenv/versions/3.7.5/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 345, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
        File "/root/.pyenv/versions/3.7.5/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 160, in prepare_metadata_for_build_wheel
          whl_basename = backend.build_wheel(metadata_directory, config_settings)
        File "/tmp/pip-build-env-ygt67bov/overlay/lib/python3.7/site-packages/sipbuild/api.py", line 51, in build_wheel
          project = AbstractProject.bootstrap('pep517')
        File "/tmp/pip-build-env-ygt67bov/overlay/lib/python3.7/site-packages/sipbuild/abstract_project.py", line 83, in bootstrap
          project.setup(pyproject, tool, tool_description)
        File "/tmp/pip-build-env-ygt67bov/overlay/lib/python3.7/site-packages/sipbuild/project.py", line 594, in setup
          self.apply_user_defaults(tool)
        File "project.py", line 62, in apply_user_defaults
          super().apply_user_defaults(tool)
        File "/tmp/pip-build-env-ygt67bov/overlay/lib/python3.7/site-packages/pyqtbuild/project.py", line 70, in apply_user_defaults
          super().apply_user_defaults(tool)
        File "/tmp/pip-build-env-ygt67bov/overlay/lib/python3.7/site-packages/sipbuild/project.py", line 241, in apply_user_defaults
          self.builder.apply_user_defaults(tool)
        File "/tmp/pip-build-env-ygt67bov/overlay/lib/python3.7/site-packages/pyqtbuild/builder.py", line 68, in apply_user_defaults
          "specify a working qmake or add it to PATH")
      sipbuild.pyproject.PyProjectOptionException
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

[bleykauf]

Tried with a new action, still failing. Relevant output:

qt.qpa.xcb: could not connect to display :99
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.