Add ziglang devcontainers template

[fardragon]

What type of PR is this?

• [x] 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

Adds ziglang devcontainers template.

Collection checklist

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

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

[fardragon]

@samruddhikhandale sorry for pinging you directly, but you seem to be the person approving things here most recently. Is there anything I can do to move this along?

[Kaniska244]

Thanks for the PR! Change approved. This can be merged.

[fardragon]

@eljog Done, thanks for approving, though I guess it needs to be approved one more time after resolving the conflicts