fix: handle spaces in Python image COPY paths

[nkgotcode]

Description

Handle Python SDK image COPY directives with local file or directory paths that contain spaces by emitting Dockerfile JSON-array syntax and parsing JSON-form COPY sources when reading a Dockerfile.

Fixes #2700

Documentation

• No documentation update is required for this Python SDK bug fix.
• No documentation changes were needed.

Related Issue(s)

This PR addresses issue #2700.

Screenshots

n/a

Notes

Validation:

PYTHONPATH="libs/sdk-python/src:libs/api-client-python:libs/api-client-python-async:libs/toolbox-api-client-python:libs/toolbox-api-client-python-async" libs/sdk-python/.venv/bin/pytest libs/sdk-python/tests/test_image.py::TestImageFromDockerfile libs/sdk-python/tests/test_image.py::TestImageAddLocal -q

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Summary by cubic

Fix handling of Dockerfile COPY paths with spaces in the Python SDK by emitting JSON-array syntax and parsing JSON-form COPY directives when reading Dockerfiles. Fixes #2700.

• Bug Fixes
  • Emit JSON-array args for COPY in add_local_file/add_local_dir to preserve spaces.
  • Parse JSON-form COPY with json.loads and validate string elements when loading a Dockerfile.
  • Add tests for JSON COPY parsing and paths with spaces.

^{Written for commit 7345a6c. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}