Add Webloo custom-domain template

[rpastorelli]

Description

Adds a template for Webloo (webloo.com.br, service custom-domain). Webloo
is a multi-tenant website platform; this template points a customer's subdomain
at Webloo and provisions the SSL-validation TXT record so the certificate can be
issued automatically. Same shape as the existing Cloudflare-for-SaaS custom-domain
templates in this repo.

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?

Please mark the following checks done

• 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

Checklist of common problems

• syncPubKeyDomain is set — not set; see justification below (unsigned synchronous flow with warnPhishing)
• warnPhishing is not set alongside syncPubKeyDomain — only warnPhishing is set, never both
• syncRedirectDomain is set whenever the template uses redirect_uri in the synchronous flow
• no TXT record contains SPF content ("v=spf1 ...")
• txtConflictMatchingMode is set on every TXT record that must be unique
• no variable is used as a bare full record value — the TXT value is SSL validation content, justified below
• no bare variable is used as the full host label — hosts are fixed (@, _acme-challenge)
• no variable is used in the host field to create a subdomain — the host parameter is used (hostRequired: true)
• %host% does not appear explicitly in any host attribute
• essential is set to OnApply — n/a, both records are required for the service

Justifications

• syncPubKeyDomain omitted: this uses the unsigned synchronous flow with
  warnPhishing: true (the documented fallback). Request signing is planned as a
  follow-up; happy to add syncPubKeyDomain if required for acceptance.
• Bare %txtvalue% in the TXT: this is the ACME/SSL domain-control-validation
  value issued per hostname; it has no fixed content prefix to embed.

Online Editor test results

Editor test link(s):
Test webloo.com.br/custom-domain webloo.com.br/www

[github-actions]

✅ JSON Filename Check Passed

[github-actions]

✅ JSON Schema Validation Passed

[github-actions]

Linter OK

webloo.com.br.custom-domain.json

Level	Code	Note
info	DCTL1029	template does not have syncPubKeyDomain

[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: 8/10 checkboxes ticked
  OK  Online Editor test results: 1 link(s) found
  OK  Template coverage: all 1 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