feat(dl): add oci.download-file-sha256 API

[wuhuizuo]

Signed-off-by: wuhuizuo wuhuizuo@126.com

[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.

This pull request adds a new API DownloadFileSha256 to the oci service. The API returns the SHA256 hash of a specific file in an OCI artifact.

Key Changes:

• DownloadFileSha256 method is added to the oci service. This method requires repository, file and tag as parameters and returns the length and content disposition of the downloaded content.
• New endpoints for DownloadFileSha256 are added.
• The download-file-sha256 CLI command is added to the oci service.
• BuildDownloadFileSha256Payload function is added to build the payload for the DownloadFileSha256 endpoint from CLI flags.
• DownloadFileSha256 client method is added to the oci service client.
• GetFileSHA256 function is added to the oci package to get the SHA256 hash of a specific file in an OCI artifact.
• A number of files have been auto-generated by the goa tool.

Potential Problems:

• There are no unit tests provided for the changes.
• Error handling might not be proper in some cases, for example, when the SHA256 hash of a file can't be fetched.
• The content type for the DownloadFileSha256 API is set to "application/plain-text". If the hash is being returned as a string, "text/plain" might be a more appropriate content type.

Suggestions for Improvement:

• Add unit tests to cover the new functionality and ensure it works as expected.
• Review error handling and ensure all edge cases are properly handled.
• Consider changing the content type to "text/plain" for returning textual data.

[wuhuizuo]

/approve

[ti-chi-bot]

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This pull-request has been approved by: wuhuizuo

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