On debexpo_exec, set TMPDIR to a context managed TemporaryDirectory() (Closes: #147)

Baptiste Beauplatrequested to merge
lyknode/debexpo:fix/tmpdir into live

In debexpo_exec(), use a TempoaryDirectory() in a context manager to ensure $TMPDIR is removed on __exit__.

This way, whether a process exit successfully, unsuccessfully or is killed, it won't leave any files in $TMPDIR.

Test added to cover:

  • Successful exec
  • Failed exec (Timeout)
  • Unsuccessful exec with custom env

Closes: #147 (closed)

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