Enables organizational separation within registry hosts by adding
optional path_prefix configuration. This supports common use cases
like Harbor projects, private registry namespaces, and organizational
hierarchies.
Key changes:
- Add path_prefix field to Registry class with automatic slash
normalization
- Update DockerSyncImagesKeywords to construct URLs with path prefixes
- Enhance configuration documentation with path_prefix examples
- Add unit tests for path_prefix handling and URL construction
Examples:
- Harbor projects: "project-x/test" -> harbor.com/project-x/test/busybox
- Team namespaces: "team-a" -> registry.com/team-a/my-image
The path_prefix field is optional and trailing slashes are normalized
automatically, making configuration flexible while ensuring correct
URLs.
Change-Id: I4784bc10e61840901baeaef2b69f323956bc23c3
Signed-off-by: Andrew Vaillancourt <andrew.vaillancourt@windriver.com>
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