Add dev containers to collection index

[metinsenturk]

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

This PR adds my collection of dev container templates to the public index.

1. Python + uv (Ubuntu-based):

   • Uses mcr.microsoft.com/devcontainers/base:ubuntu as a stable base.
   • Not bloated with multiple package managers; uses only uv to manage Python versions and dependencies.
   • Dynamically installs the environment on container creation for a clean, minimal setup.

2. Python + Pipx & Enhanced Shell:

   • Includes Python and pipx for isolated tool management.
   • Pre-configured terminal experience with zsh and the starship prompt.

Collection checklist

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

• Collection name: Metin's Dev Containers
• Maintainer name: Metin Senturk
• Maintainer contact link (i.e. link to a GitHub repo, email): https://github.com/metinsenturk
• Repository URL: https://github.com/metinsenturk/devcontainer-templates
• OCI Reference: ghcr.io/metinsenturk/devcontainer-templates
• I acknowledge that this collection provides new functionality, distinct from the existing collections part of this index.

[Copilot]

Pull request overview

Adds a new dev container collection entry to the public collection index.

Changes:

• Added “Metin's Dev Containers” collection metadata (maintainer, contact, repository, OCI reference) to the index.

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