From the documentation, I see that it’s possible to sign xcode/iOS projects using Fastlane. However, I intend to distribute a pkg installer, which needs to be signed with the productbuild command-line utility. The problem is, productbuild requires that both the certificate and private key be available on the keychain, and as far as I can tell, the only files circleCI will handle in the code signing section are the private keys (.p12) and mobileprovision files (which don’t help me in this case).
So the question is: is it at all possible to manually sign code? If not, are there any suggested workarounds?