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Add support for Google Artifact Registry (GAR) (#692)

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<!-- Provide a brief summary of your changes -->

## Motivation and Context
<!-- Why is this change needed? What problem does it solve? -->
The following PR:
* Deprecates the existing OCI reference parser
* Deprecates the existing OCI way of authenticating and accessing the
image manifest
* Replaces the above by leveraging go-containerregistry
* Introduces support for Google Artifact Registry
* Enables us to easily add support for other OCI-compliant registries in
the future
* Introduces better error handling
* Introduces custom context timeouts for validation 

## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->

## Breaking Changes
<!-- Will users need to update their code or configurations? -->

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->
Related to #427

---------

Signed-off-by: Radoslav Dimitrov <radoslav@stacklok.com>
This commit is contained in:
Radoslav Dimitrov 2025-10-28 15:00:06 +02:00 • committed by GitHub
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docs/guides/publishing/publish-server.md
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@ -313,7 +313,10 @@ LABEL io.modelcontextprotocol.server.name="io.github.username/server-name"
The identifier format is `registry/namespace/repository:tag` (e.g., `docker.io/user/app:1.0.0` or `ghcr.io/user/app:1.0.0`). The version can also be specified as a digest.
The official MCP registry currently supports Docker Hub (`docker.io`) and GitHub Container Registry (`ghcr.io`).
The official MCP registry supports:
- Docker Hub (`docker.io`)
- GitHub Container Registry (`ghcr.io`)
- Google Artifact Registry (any `*.pkg.dev` domain)
</details>