Quote echo $data in _porkbun_rest to avoid
brace expansion under ksh (OpenBSD).

- New CLI param: --extended-key-usage <string>
- When --extended-key-usage is defined:
  1. Set [v3_req]extendedKeyUsage to the provided value.
  2. Store the value in domain conf Le_ExtKeyUse for reuse.

Instead of using comments declare info in a special variable.
Then the variable can be used to print the DNS API provider usage.
The usage can be parsed on UI and show all needed inputs for options.

The info is stored in plain string that it's both human-readable and easy to parse:

    dns_example_info='API name
     An extended description.
     Multiline.
    Domains: list of alternative domains to find
    Site: the dns provider website e.g. example.com
    Docs: Link to ACME.sh wiki for the provider
    Options:
     VARIABLE1 Title for the option1.
     VARIABLE2 Title for the option2. Default "default value".
     VARIABLE3 Title for the option3. Description to show on UI. Optional.
    Issues: Link to a support ticket on https://github.com/acmesh-official/acme.sh
    Author: First Lastname <[email protected]>, Another Author <https://github.com/example>;
    '

Here:
VARIABLE1 will be required.
VARIABLE2 will be required too but will be populated with a "default value".
VARIABLE3 is optional and can be empty.

A DNS provider may have alternative options like CloudFlare may use API KEY or API Token.
You can use a second section OptionsAlt: section.

Some providers may have alternative names or domains e.g. Aliyun and AlibabaCloud.
Add them to Domains: section.

Signed-off-by: Sergey Ponomarev <[email protected]>

Add notification support for ntfy.sh

Structured DNS provider API info

dns_1984.hosting - update _get_root check

Quote echo $data in _porkbun_rest (dns_porkbun)

Feature: DNS API for IONOS cloud

it is related to this bug report: opnsense/plugins#3525

FreeBSD's sed doesn't have the -z option, so empty certificates are delivered to vault when running the script on FreeBSD.

improve compatibility with FreeBSD

#5170

feat: Support manually defining extended key usage in CSR

Improve grammar

#5200