ci: cancel in-progress on repeated pushes

[henryiii]

Description

Can help if development is moving faster than the CI builds.

[henryiii]

Weird, MinGW died:

Python path configuration:
  PYTHONHOME = (not set)
  PYTHONPATH = (not set)
  program name = 'python3'
  isolated = 0
  environment = 1
  user site = 1
  import site = 1
  sys._base_executable = 'D:/a/pybind11/pybind11/build/tests/test_embed/test_embed.exe'
  sys.base_prefix = 'D:/a/_temp/msys/msys64/mingw64'
  sys.base_exec_prefix = 'D:/a/_temp/msys/msys64/mingw64'
  sys.platlibdir = 'lib'
  sys.executable = 'D:/a/pybind11/pybind11/build/tests/test_embed/test_embed.exe'
  sys.prefix = 'D:/a/_temp/msys/msys64/mingw64'
  sys.exec_prefix = 'D:/a/_temp/msys/msys64/mingw64'
  sys.path = [
    'D:/a/_temp/msys/msys64/mingw64/lib/python39.zip',
    'D:/a/_temp/msys/msys64/mingw64/lib/python3.9',
    'D:/a/_temp/msys/msys64/mingw64/lib/lib-dynload',
    '',
  ]
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

[henryiii]

@lkeegan or @jeromerobert, any idea why minGW jobs are broken?

[jeromerobert]

@henryiii see msys2/setup-msys2#167

[jeromerobert]

I tried that and it works: cocotb/cocotb@05036cb (as temporary solutions)

[jeromerobert]

#3375