Through OS X v10.11.4, you could sign the disk image itself (with codesign -s "Developer ID Application: " example.dmg), but the signature this creates is stored in the form of extended attributes attached to the image file. Starting in OS X 10.11.5, signing disk images is properly supported and sometimes required, but that's in addition to signing the relevant items inside it. After the image is downloaded, the signature on the individual items will be checked as they are used. In general, the thing you really need to sign is the files (mainly the app) inside the disk image, not the image itself.
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