When trying to use the Xcode plugin to build a project and generate a .dSYM zip file, the Xcode plugin apparently is trying to compose a path to the .dSYM source directory incorrectly. See the attached snippet from the log file:

[Release-iphoneos] $ zip -r -T -y Boomle-Release-2.0-dSYM.zip /Users/autobuild/build/workspace/Boomle/output/Release-iphoneos/Boomle.app.app.dSYM
zip warning: name not matched: /Users/autobuild/build/workspace/Boomle/output/Release-iphoneos/Boomle.app.app.dSYM

zip error: Nothing to do! (try: zip -r -T -y Boomle-Release-2.0-dSYM.zip . -i /Users/autobuild/build/workspace/Boomle/output/Release-iphoneos/Boomle.app.app.dSYM)
Failed to zip *.dSYM into Boomle-Release-2.0-dSYM.zip

As you can see, it is appending ".app.app" instead of ".app". The "Boomle.app.dSYM" directory does exist in the indicated directory as expected, so it appears that the plugin is simply composing the path incorrectly.