feat: add devcontainer features by ebizbase to collection

[johnitvn]

What type of PR is this?

• Add a new dev container collection
• Update to an existing dev container collection
• Documentation/spec update
• Other containers.dev site update (UX, layout, etc)

Related Issues

• Related Issue #
• Closes #

Description

Please replace this line with a description of your PR.

Collection checklist

If your PR contributes a new collection, please utilize this checklist:

• Collection name
• Maintainer name
• Maintainer contact link (i.e. link to a GitHub repo, email)
• Repository URL
• OCI Reference
• I acknowledge that this collection provides new functionality, distinct from the existing collections part of this index.

[Copilot]

Pull request overview

This PR adds the "devcontainer features by ebizbase" collection to the devcontainer collection index, expanding the available community-maintained features for development containers.

Key Changes:

• Added new collection entry for eBizBase's devcontainer features
• Includes all required metadata: name, maintainer, contact, repository, and OCI reference

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