new: [dnsapi] RESTENA DNS API

[SteveClement]

Add Restena DNS API support

This PR adds support for Restena DNS API (https://dnsgui.restena.lu/) which is used primarily in Luxembourg.

Features

• Add TXT records for ACME challenge
• Remove TXT records after validation
• Proper credential handling for automatic renewals

Testing

• Tested with staging environment
• Tested certificate issuance
• Tested automatic renewal

Usage

export RESTENA_TOKEN="your_api_token" 
export RESTENA_ZONE="your_zone.com"
acme.sh --issue -d example.com --dns dns_restena

[github-actions]

Welcome
READ ME !!!!!
Read me !!!!!!
First thing: don't send PR to the master branch, please send to the dev branch instead.
Please read the DNS API Dev Guide.
You MUST pass the DNS-API-Test.
Then reply on this message, otherwise, your code will not be reviewed or merged.
Please also make sure to add/update the usage here: https://github.com/acmesh-official/acme.sh/wiki/dnsapi2
注意: 必须通过了 DNS-API-Test 才会被 review. 无论是修改, 还是新加的 dns api, 都必须确保通过这个测试.

[SteveClement]

Welcome READ ME !!!!! Read me !!!!!! First thing: don't send PR to the master branch, please send to the dev branch instead. Please read the DNS API Dev Guide. You MUST pass the DNS-API-Test. Then reply on this message, otherwise, your code will not be reviewed or merged. Please also make sure to add/update the usage here: https://github.com/acmesh-official/acme.sh/wiki/dnsapi2 注意: 必须通过了 DNS-API-Test 才会被 review. 无论是修改, 还是新加的 dns api, 都必须确保通过这个测试.

Basic tests passed, reply made ;)

[SteveClement]

Fixed shellcheck/shfmt errors.

[SteveClement]

Updated Wiki Page