feat: generate ibmgpfs charm

[ahmad-can]

Related Charm https://review.opendev.org/c/openstack/sunbeam-charms/+/983829

[Copilot]

Pull request overview

Adds a new IBM GPFS (ibmgpfs) Cinder storage backend implementation to Sunbeam, plus unit tests and common test fixture updates so the backend participates in the shared backend test suite.

Changes:

• Introduces IbmgpfsBackend and IbmgpfsConfig (Pydantic config model) for the new backend.
• Adds a dedicated unit test module for ibmgpfs and updates shared backend tests to include it.
• Extends pytest fixtures to provide the new backend instance and include it in parametrized runs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sunbeam-python/sunbeam/storage/backends/ibmgpfs/backend.py	New GPFS backend + config model definition.
sunbeam-python/sunbeam/storage/backends/ibmgpfs/init.py	Package init for the new backend module.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_ibmgpfs.py	New unit tests for ibmgpfs backend and config validation.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_common.py	Adds ibmgpfs to shared uniqueness/expectation tests.
sunbeam-python/tests/unit/sunbeam/storage/backends/conftest.py	Adds ibmgpfs_backend fixture + includes it in any_backend.

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