python: add missing workingDir

[kadel]

What does this PR do?:

Which issue(s) this PR fixes:

fixes devfile/api#777

PR acceptance criteria:

• Contributing guide
  Have you read the devfile registry contributing guide and followed its instructions?
• Test automation
  Does this repository's tests pass with your changes?
• Documentation
  Does any documentation need to be updated with your changes?

How to test changes / Special notes to the reviewer:

[elsony]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: elsony, kadel

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[elsony]

/retest

[johnmcollier]

/retest

[johnmcollier]

/retest

[openshift-ci]

@kadel: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.7-registry-test	82219cb	link	true	/test v4.7-registry-test

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[johnmcollier]

CI failures due to known issue which has been fixed, I'm gonna merge this, no point retesting since the modified stacks (python, python-django) were fine.