GitHub Actions: bump action versions

rsyncd: add HandleConnArgs (rsyncopts is not exported)We should refactor InternalHandleConn away eventually.

rsyncd: swap parameters in HandleConn for consistency

support multiple source args (+test)The key part was to move the module name stripping to the right place.

add rsynccmd entrypointThis is a generic entrypoint into any supported rsync functionality.If you want to implement a server, see github.com/gokrazy/rsync/rsyncd.

fix GOOS=linux staticcheck errorsrelated to#10

goreleaser: remove gokr-rsyncd (use gokr-rsync --daemon instead)

add goreleaser config