Add Better Stack status page template

[dmajda]

Description

H! At Better Stack, we're implementing Domain Connect so that users can easily add CNAME records for status pages on their own domains. This PR adds a template to allow that.

Type of change

Please mark options that are relevant.

• 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

• Schema validated using JSON Schema template.schema
• Template functionality checked using Online Editor
• Template is checked using template linter
• Template file name follows the pattern <providerId>.<serviceId>.json

Example variable values

The template doesn't use any variables.

[github-actions]

Linter OK:

Linter result for betterstack.com.status-page.json

[pawel-kow]

Not necessarily an issue with the template. It's good and simple, but so short TTL would increase load on DNS servers, so there should be a good reason.

[dmajda]

Thanks for a super-fast review & merge! 🙏