prevent `fdroid publish` from repeatedly downloading the developer binary
prevent `fdroid publish` from repeatedly downloading the developer binary

wget's --continue makes wget not overwrite the existing file, or create a
new version with a .1 extension.  Instead it tries to finish an incomplete
download, or does nothing if the download is complete and matching.

matlink/fdroidserver,OneEducation/AppUniverse_Server,matlink/fdroidserver,fdroidtravis/fdroidserver,matlink/fdroidserver,fdroidtravis/fdroidserver,matlink/fdroidserver,f-droid/fdroidserver,matlink/fdroidserver,OneEducation/AppUniverse_Server,fdroidtravis/fdroidserver,f-droid/fdroidserver,OneEducation/AppUniverse_Server,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroid-server,OneEducation/AppUniverse_Server,OneEducation/AppUniverse_Server,fdroidtravis/fdroidserver,f-droid/fdroidserver