CI: enable support to skip packaging
CI: enable support to skip packaging

When running just the tests for certain components, it would be
preferable to skip the packaging which can take a few minutes.

glessard/swift,benlangmuir/swift,JGiola/swift,benlangmuir/swift,apple/swift,glessard/swift,roambotics/swift,JGiola/swift,roambotics/swift,apple/swift,glessard/swift,JGiola/swift,JGiola/swift,benlangmuir/swift,apple/swift,roambotics/swift,roambotics/swift,JGiola/swift,JGiola/swift,roambotics/swift,benlangmuir/swift,apple/swift,roambotics/swift,apple/swift,glessard/swift,apple/swift,benlangmuir/swift,glessard/swift,benlangmuir/swift,glessard/swift