Add dnsapi script for HE DDNS

[markkuleinio]

This uses the HE DNS DDNS API shown in https://dns.he.net/. The DDNS API only updates the existing record, so the API key is record-specific, and no remove function is used because the record cannot be deleted.

Issue: #5238
Documentation: https://github.com/acmesh-official/acme.sh/wiki/dnsapi2#dns_he_ddns

[github-actions]

Welcome
First thing: don't send PR to the master branch, please send to the dev branch instead.
Please make sure you've read our DNS API Dev Guide and DNS-API-Test.
Then reply on this message, otherwise, your code will not be reviewed or merged.
We look forward to reviewing your Pull request shortly ✨
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.

[markkuleinio]

Then reply on this message, otherwise, your code will not be reviewed or merged.

Replying already, even though the instructions in https://github.com/acmesh-official/acme.sh/wiki/DNS-API-Test were not exact to be followed by a GitHub Actions newcomer like me. So I'll keep working on that still.

[markkuleinio]

Got the workflow started, but unfortunately the unit tests fail because of this requirement:

     _assertcmd "$addcommand acmetestXyzRandomName.$TestingDomain $record_content"  ||  return

In HE DDNS API it is not possible to create arbitrary records because the API key is dedicated to the specific pre-existing record (_acme-challenge.example.com).

That's why I also had to add TEST_DNS_NO_SUBDOMAIN=1 and TEST_DNS_NO_WILDCARD=1 to get it going that far (= the test for normal dns-01 verification worked fine).

The DNS API works with in my production environment though.

[markkuleinio]

Any comments on merging or discarding this?

[Gorgonbert]

Any comments on merging or discarding this?

I'd like to know as well, as this script would solve an issue I have.

Thank you 🙏