Salsa CI autopkgtest job fails due to /tmp no being writable

[Sebastiaan Couwenberg]

The netcd4-python autopkgtest jobs are failing because /tmp is not writable:

  ======================================================================
  ERROR: runTest (test_unlimdim.UnlimdimTestCase.runTest)
  testing unlimited dimensions
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File 
"/tmp/autopkgtest-lxc.07u71cn4/downtmp/autopkgtest_tmp/build/test/test_unlimdim.py", 
line 24, in setUp
      f  = netCDF4.Dataset(self.file, 'w')
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "src/netCDF4/_netCDF4.pyx", line 2470, in 
netCDF4._netCDF4.Dataset.__init__
    File "src/netCDF4/_netCDF4.pyx", line 2107, in 
netCDF4._netCDF4._ensure_nc_success
  PermissionError: [Errno 13] Permission denied: '/tmp/tmpf9oihfd5.nc'

https://salsa.debian.org/debian-gis-team/netcdf4-python/-/jobs/5860278

It uses the Python tempfile module which should adhere to TMPDIR, is 
that set for Salsa CI jobs?

I know AUTOPKGTEST_TMP is available for autopkgtest jobs, but should 
that make regular /tmp unavailable?

Kind Regards,

Bas

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