Invalid Openrc support

[qaqland]

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Description

It is invalid to use systemd in Openrc

https://github.com/jeessy2/ddns-go/blob/v6.9.1/main.go#L236 https://github.com/jeessy2/ddns-go/blob/v6.9.1/main.go#L245

DNS Provider

No response

Did you search for similar issues before submitting this one?

Yes

Operating System

Linux

Architecture

x86_64

Version

6.9.1

How are you running ddns-go?

Service

Any other information

Steps to reproduce

$ doas ddns-go -s install