Remove duplicates and add GitHub action to lint collection-index.yml

[AlvaroRausell]

• Fixes duplicates causing the crawler to fail.
• Adds a GitHub action that lints collection-index.yml before merging

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.

[github-actions]

yamllint Failed

Show Output

::group::_data/collection-index.yml
::warning file=_data/collection-index.yml,line=1,col=1::1:1 [document-start] missing document start "---"
::error file=_data/collection-index.yml,line=154,col=81::154:81 [line-length] line too long (81 > 80 characters)
::error file=_data/collection-index.yml,line=268,col=81::268:81 [line-length] line too long (84 > 80 characters)
::error file=_data/collection-index.yml,line=298,col=81::298:81 [line-length] line too long (87 > 80 characters)
::error file=_data/collection-index.yml,line=299,col=81::299:81 [line-length] line too long (83 > 80 characters)
::error file=_data/collection-index.yml,line=923,col=81::923:81 [line-length] line too long (91 > 80 characters)
::error file=_data/collection-index.yml,line=924,col=81::924:81 [line-length] line too long (87 > 80 characters)
::error file=_data/collection-index.yml,line=987,col=81::987:81 [line-length] line too long (83 > 80 characters)
::error file=_data/collection-index.yml,line=995,col=81::995:81 [line-length] line too long (90 > 80 characters)
::error file=_data/collection-index.yml,line=998,col=81::998:81 [line-length] line too long (84 > 80 characters)
::error file=_data/collection-index.yml,line=1037,col=81::1037:81 [line-length] line too long (81 > 80 characters)
::error file=_data/collection-index.yml,line=1179,col=42::1179:42 [trailing-spaces] trailing spaces
::error file=_data/collection-index.yml,line=1233,col=81::1233:81 [line-length] line too long (85 > 80 characters)
::error file=_data/collection-index.yml,line=1238,col=81::1238:81 [line-length] line too long (100 > 80 characters)
::endgroup::

Workflow: Lint collection-index.yml, Action: __karancode_yamllint-github-action, Lint: _data/collection-index.yml

[chrmarti]

Thanks!