feat(BA-2850): Support OCP Container Registry

[jopemachine]

resolves #6467 (BA-2850)

Checklist: (if applicable)

• Mention to the original issue

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📚 Documentation preview 📚: https://sorna--6464.org.readthedocs.build/en/6464/

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📚 Documentation preview 📚: https://sorna-ko--6464.org.readthedocs.build/ko/6464/

[Copilot]

Pull request overview

This PR adds support for OpenShift Container Platform (OCP) container registries to the Backend.AI system. The implementation allows users to configure and use OCP registries as a source for container images.

Key changes:

• Added new "ocp" registry type to the ContainerRegistryType enum
• Implemented OpenShiftPlatformContainerRegistry class to handle OCP-specific registry operations
• Increased registry_name column length from 50 to 255 characters to accommodate longer OCP registry names

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/ai/backend/common/container_registry.py	Added OCP enum value to ContainerRegistryType
src/ai/backend/manager/models/container_registry.py	Increased registry_name field length to 255 characters
src/ai/backend/manager/models/alembic/versions/b0fb0eb6b6bc_remove_container_registries_registry_.py	Database migration to update registry_name column length
src/ai/backend/manager/container_registry/ocp.py	New OCP registry implementation using Docker Registry API v2
src/ai/backend/manager/container_registry/init.py	Added OCP registry type to factory function
fixtures/manager/example-container-registries-ocp.json	Example configuration for OCP registry
docs/manager/rest-reference/openapi.json	Updated OpenAPI schema with ocp type
docs/manager/graphql-reference/supergraph.graphql	Updated GraphQL documentation with ocp type
docs/manager/graphql-reference/schema.graphql	Updated GraphQL schema documentation with ocp type
changes/6464.feature.md	Changelog entry for OCP support

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[seedspirit]

Is there any additional OCP registry metadata validation logic to be added to ContainerRegistryValidator?

[jopemachine]

Is there any additional OCP registry metadata validation logic to be added to ContainerRegistryValidator?

No, these PR changes are unrelated to ContainerRegistryValidator.
What made you think so? @seedspirit

[seedspirit]

No, these PR changes are unrelated to ContainerRegistryValidator.

When attempting to register a registry with the Container Registry Type set to Harbor, validations are performed such as checking the registry name length, whether a project has been entered, and whether the project name pattern is correct. I was wondering whether OCP also requires such validations. @jopemachine

[jopemachine]

I've added ContainerRegistryValidator for checking project length check which could be different according to the registry type.
I couldn't find information on project length limits on the OCP registry, (But it can be easily added if needed)