add CoDuck, 2 templates

[LiamBMX]

Description

Adds two templates for CoDuck (coduck.ai), an AI app-building and hosting platform, so users can connect custom domains to their CoDuck-hosted sites without manually editing DNS records:

• coduck.ai.hosting-apex.json — root domain: A @ to CoDuck's hosting IP, CNAME www → @ (we serve the www variant on one certificate), and a _coduck-verify TXT ownership-verification record.
• coduck.ai.hosting-subdomain.json — subdomain (hostRequired): CNAME to the project's %target%.coduck.app hostname plus the same _coduck-verify TXT record.

Both templates pass dc-template-linter with no errors or warnings (only info-level DCTL1021 for the _coduck-verify underscore label, which is our service-specific verification name).

Type of change

• New template
• Bug fix (non-breaking change which fixes an issue in the template)
• New feature (non-breaking change which adds functionality to the template)
• Breaking change (fix or feature that would cause existing template behavior to be not backward compatible)

How Has This Been Tested?

• Template functionality checked using Online Editor
• Template file name follows the pattern <providerId>.<serviceId>.json
• resource URL provided with logoUrl is actually served by a webserver — no logoUrl is set on either template (it is optional), so there is no unserved resource.

Checklist of common problems

• syncPubKeyDomain is set — coduck.ai on both templates
• warnPhishing is not set alongside syncPubKeyDomain
• syncRedirectDomain is set — coduck.ai,app.coduck.ai; the synchronous flow uses redirect_uri back to our app
• no TXT record contains SPF content
• txtConflictMatchingMode is set on the verification TXT records (All — the _coduck-verify label is exclusively ours, so any pre-existing TXT there is a stale token that should be replaced)
• no variable is used as a bare full record value — the token is embedded in a fixed prefix (coduck-verify=%token%), and the subdomain CNAME target is constrained to our zone (%target%.coduck.app)
• no bare variable is used as the full host label — all host fields are fixed (@, www, _coduck-verify)
• no variable is used in the host field to create a subdomain — the subdomain template relies on the standard host parameter (hostRequired: true)
• %host% does not appear explicitly in any host attribute
• essential is not needed — all records are required for the service to function and are re-verified by CoDuck's periodic health checks, so none are intended for independent end-user modification

Online Editor test results

Editor test link(s):

• Test coduck.ai/hosting-apex — apex (example.com, no host)
• Test coduck.ai/hosting-apex — with host (example.com, host=www)
• Test coduck.ai/hosting-subdomain — with host (example.com, host=blog)

[github-actions]

✅ JSON Filename Check Passed

[github-actions]

✅ JSON Schema Validation Passed

[github-actions]

Linter OK

coduck.ai.hosting-apex.json

Level	Code	Note
info	DCTL1021	missing from iana definitions

coduck.ai.hosting-subdomain.json

Level	Code	Note
info	DCTL1021	missing from iana definitions

[github-actions]

PR Description Check Passed

All required sections are filled in correctly.

Details

  OK  Type of change: 1/4 checkboxes ticked
  OK  How Has This Been Tested?: all 3 checkboxes ticked
  OK  Checklist of common problems: 10/10 checkboxes ticked
  OK  Online Editor test results: 3 link(s) found
  OK  Template coverage: all 2 template(s) covered
Labels to remove: Checklist of common problems not complete, Forged editor links, PR description incomplete, Test links missing

PR description check PASSED

[github-actions]

Thanks @LiamBMX for contributing to the template. 🎉

This template has been reviewed and merged by @pawel-kow. 🙌

This template repository and its review process are maintained by independent individuals in their spare time, not as part of a paid role. If you or your company benefit from this protocol and its tools, please show your appreciation by buying a beer for @pawel-kow: https://github.com/sponsors/pawel-kow