Changes

• fix: Python local pack build.
  Local pack build was not working because of absent scaffolding. Fix is done by doing scaffolding in docker client (that is passed into constructor of pack client). Basically our custom docker client hijacks tar stream and alters it. It moves content of /workspace/ into /workspace/fn and then puts scaffolding directly into /workspace, the scaffolding then refers handler in ./fn.

So when pack clients tires to upload something like:

/workspace/func.yaml
/workspace/handler.py
/workspace/pyproject.toml

The actual content pushed to container is:

/workspace/fn/func.yaml
/workspace/fn/handler.py
/workspace/fn/pyproject.toml
/workspace/main.py           # scaffolding main
/workspace/pyproject.toml    # scaffolding project toml refering ./fn

The thing is that the Python paketo buildpack (as opposed to Node or Go) does not allow build form sub-directory, the project must be in workspace root.

This is just temporary hacky solution, we should come up with something better in future.

• fix: sane LISTEN_ADDRESS default for local pack build

/kind bug

fix: Python local buildpack build