Add a now cloud provider: PPIO

[Yexiu-PPIO]

Add a now cloud provider: PPIO

Tested (run the relevant ones):

• Code formatting: install pre-commit (auto-check on commit) or bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: /smoke-test (CI) or pytest tests/test_smoke.py (local)
• Relevant individual tests: /smoke-test -k test_name (CI) or pytest tests/test_smoke.py::test_name (local)
• Backward compatibility: /quicktest-core (CI) or pytest tests/smoke_tests/test_backward_compat.py (local)

[gemini-code-assist]

Summary of Changes

Hello @Yexiu-PPIO, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces PPIO as a new cloud provider within SkyPilot, expanding the platform's capabilities to include GPU instance provisioning and management on the PPIO infrastructure. The changes encompass the addition of PPIO-specific adaptors, catalog fetching mechanisms, authentication handlers, and a dedicated provisioner for managing instance lifecycles. A new Ray cluster template is provided to leverage PPIO's unique configuration options. The integration also clearly defines current limitations, such as the lack of support for spot instances, multi-node clusters, and advanced storage features, ensuring users have a clear understanding of the available functionalities.

Highlights

• New Cloud Provider Integration: PPIO has been added as a new cloud provider, enabling SkyPilot to provision and manage GPU instances on the PPIO platform.
• PPIO Adaptor and Catalog: Dedicated modules (sky/adaptors/ppio.py, sky/catalog/ppio_catalog.py) and a data fetching script (sky/catalog/data_fetchers/fetch_ppio.py) have been introduced to handle PPIO-specific API interactions, instance type cataloging, and credential management.
• Authentication and Provisioning: New functions (setup_ppio_authentication) and a provisioner (sky/provision/ppio) are implemented to manage SSH authentication (local key generation, no upload to PPIO) and instance lifecycle (run, terminate, query status).
• Ray Cluster Template: A new Jinja2 template (sky/templates/ppio-ray.yml.j2) is added to configure Ray clusters on PPIO, supporting various PPIO-specific instance parameters like imageUrl, ports, envs, command, networkStorages, and rootfsSize.
• Unsupported Features: The PPIO integration explicitly marks several features as unsupported, including stopping instances, multi-node clusters, spot instances, custom disk/network tiers, storage mounting, host controllers, image IDs, and Docker images, reflecting current PPIO platform limitations.
• System-wide Integration: PPIO is integrated into SkyPilot's core components, including sky/__init__.py, sky/backends/backend_utils.py, sky/backends/cloud_vm_ray_backend.py, sky/clouds/__init__.py, sky/provision/__init__.py, sky/setup_files/dependencies.py, sky/skylet/constants.py, and sky/utils/schemas.py.
• Test Suite Updates: Existing smoke tests are updated with pytest.mark.no_ppio for functionalities not yet supported by the PPIO integration, ensuring test compatibility and preventing failures.

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[gemini-code-assist]

Code Review

This pull request introduces support for a new cloud provider, PPIO. The changes are comprehensive, covering authentication, backend logic, catalog fetching, and provisioning, and they align well with the existing patterns for adding new providers.

My review highlights a critical issue in the provisioning logic that would prevent instance creation, as well as a missing dependency that would break the integration. I've also included several suggestions to improve code maintainability and readability, such as refactoring repetitive code, clarifying magic numbers, and documenting hardcoded logic. Addressing these points will help ensure the PPIO integration is robust and easy to maintain.

[Yexiu-PPIO]

@aylei Could I ask you to review?