add IP4_STATIC IP6_STATIC

[ZILosoft]

🚀 Add Static IP Support

Summary

Adds support for static IP addresses alongside dynamic detection. Enables multiple A/AAAA records per domain.

🔧 Features

• New Env Vars:
  • IP4_STATIC: comma-separated IPv4 list
  • IP6_STATIC: comma-separated IPv6 list
• Composite Provider:
  • Combines dynamic + static IPs

✅ Backwards Compatible

• Existing configs work without changes
• Dynamic-only setups remain unaffected

🛠 Usage

IP4_STATIC=192.168.1.100,10.0.0.5 ./ddns

[favonia]

@ZILosoft Thanks for the PR! I actually have a different plan that should eventually cover what you're looking for. The idea is to implement record comments as filters (you can see the details in #1045). This would let us tell static records apart from dynamic ones, and the tool would then simply ignore the static ones. Does that sound like a good alternative to you? Unfortunately, I'm stuck in a tough spot right now that's keeping me from working on this project (including reviewing PRs). Hope your fork is working well for you in the meanwhile!