[FEAT] Build images for pre-release

[Byh0ki]

Is this a new feature request?

• [X] I have searched the existing issues

Wanted change

Hello,

ddclient is released very rarely, as stated by @nemchik here, would it be possible to get the pre-relase versions too?

(cf. https://github.com/linuxserver/docker-ddclient/issues/45 but I can't comment on it as it's locked)

Reason for change

It would be nice to have the latest features but also to test issues on recent code.

Proposed code change

No response

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