Commands from Python devfile should be improved

[svor]

/kind bug

Which area this bug is related to?

/area registry

What versions of software are you using?

Eclipse Che 7.42

Bug Summary

Describe the bug:
Commands from Python base devfile are failed.

• The reason is that workingDir is not pointed to the project sample dir.
• debugpy command uses env DEBUG_PORT which is not defined

To Reproduce:

• Create a workspace form Python devfile
• Try to execute any command

Expected behavior

Commands should be executed

Suggestion on how to fix the bug

• add workingDir: ${PROJECT_SOURCE} to each command
• set DEBUG_PORT env

[kadel]

• add workingDir: ${PROJECT_SOURCE} to each command

already fixed in devfile/registry#85

• set DEBUG_PORT env

devfile/registry#93

[svor]

already fixed in devfile/registry#85

pip-install-requirements command doesn't have workingDir https://github.com/devfile/registry/blob/main/stacks/python/devfile.yaml#L25