Update README.md

[loosebazooka]

debian13 for all images except python are ready for general use

[gemini-code-assist]

Summary of Changes

Hello @loosebazooka, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the README.md to reflect the current status of distroless images, primarily promoting Debian 13 images (except Python) to general availability. It also introduces important guidance on the Debian 13 UsrMerge scheme for rules_distroless users and clarifies the project's image tagging conventions for better understanding.

Highlights

• Debian 13 General Availability: Debian 13 distroless images, excluding Python, are now considered stable and ready for general use, removing the previous 'Preview' status and associated instability warnings.
• UsrMerge Scheme Guidance: New information has been added to the README explaining Debian 13's UsrMerge scheme and providing instructions for users of rules_distroless to set mergedusr = True in apt.install.
• Java 21 Debian 13 Image: The gcr.io/distroless/java21-debian13 image has been officially added to the list of available Debian 13 images.
• Tagging Clarification: The explanation regarding image indexes, architecture-specific tags (e.g., -amd64), and the deprecation of other tags has been moved to a more prominent position for better visibility.

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[gemini-code-assist]

Code Review

This pull request updates the README to mark the Debian 13 images as generally available, removing the 'Preview' status and the associated warnings. It also adds information about the UsrMerge scheme for Debian 13 images and includes the java21-debian13 image in the list. The changes are clear and align with the goal of the PR. I've pointed out a minor typo and a broken link in the new documentation.

[github-actions]

🌳 🔧 Config Check

This pull request has not modified the root BUILD