Use our own index-proxy instead of dockerhub directly

[Williangalvani]

Summary by Sourcery

Use our own index-proxy endpoint to retrieve image tags and eliminate the custom DockerHub fetching logic.

Enhancements:

• Switch remote image tag fetching in the version chooser to use the internal index-proxy service instead of DockerHub API.

Chores:

• Remove the TagFetcher class, TagMetadata dataclass, and related DockerHub utility code.
• Clean up imports and simplify set_remote_versions by directly extending remote tags from the proxy response.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces the custom DockerHub API client with calls to our internal index-proxy service for retrieving image tags and streamlines tag handling in the version chooser.

Sequence diagram for fetching remote image tags via index-proxy

sequenceDiagram
    participant chooser.py
    participant aiohttp.ClientSession
    participant index-proxy (logtools.cloud)
    chooser.py->>aiohttp.ClientSession: Create session
    chooser.py->>index-proxy (logtools.cloud): GET /GetImages?repository=...&arch=...&index=dockerhub
    index-proxy (logtools.cloud)-->>chooser.py: Respond with image tags (JSON)
    chooser.py->>chooser.py: Update output["remote"] with received tags

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Class diagram for removal of TagFetcher and TagMetadata

classDiagram
    class TagFetcher {
        - index_url: str
        - docker_url: str
        - last_token: str
        + fetch_sha(metadata: TagMetadata): str
        + fetch_remote_tags(repository: str, local_images: List[str]): Tuple[str, List[TagMetadata]]
    }
    class TagMetadata {
        + repository: str
        + image: str
        + tag: str
        + last_modified: str
        + sha: Optional[str]
        + digest: str
    }
    %% Both TagFetcher and TagMetadata have been removed from the codebase

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File-Level Changes

Change	Details	Files
Remove custom DockerHub client and metadata types	Delete TagFetcher class responsible for fetching tokens and tags Remove TagMetadata dataclass Eliminate related imports (aiohttp, dataclasses, typing, warnings, logger)	core/services/versionchooser/utils/dockerhub.py
Use internal index-proxy endpoint for remote tag retrieval	Replace TagFetcher.fetch_remote_tags call with aiohttp GET to internal proxy URL Pass repository, architecture, and index parameters in the request Handle HTTP status and parse JSON response for tags	core/services/versionchooser/utils/chooser.py
Simplify remote tag integration in chooser	Import get_current_arch instead of TagFetcher Remove asdict conversion of TagMetadata Extend remote tags list directly with proxy response objects	core/services/versionchooser/utils/chooser.py

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