I can create an unsigned .xcarchive easily enough with the following command:
xcodebuild archive -project myproj.xcodeproj -scheme 'the scheme' -archivePath unsigned.xcarchive -configuration Release CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO
However, the exportOptionsPlist requires a 'method' and each method it accepts appears to sign the actual ipa.
I can manually remove the signature from the IPA after it is exported, but I was hoping there was a feature in xcodebuild that would all me to do this out-of-the-box.
Is this possible? If so, how?