Jenkins - Xcode build works codesign fails

Question

Below is my build script (not using xcodebuild plugin).

1. Build step works
2. I have created a separate keychain with the required certs and private keys

Answer 1

I copied all the certs/private keys to a new keychain (you can right-click on the items and simply copy and paste). In the new keychain, right-click on each private key, Get Info -> Access Control and make the keys available to all apps.

Importantly, in the upper left of the Keychain app is the list of keychains. Re-order them so that the new keychain is first in the list.

Another answer I found gave the build step to unlock this keychain during the build:

KEYCHAIN=/Users//Library/Keychains/codesign.keychain

# the -s option adds $KEYCHAIN to the search scope, while the -d option adds $KEYCHAIN to the system domain; both are needed
security -v list-keychains -d system -s $KEYCHAIN
security -v unlock-keychain -p  $KEYCHAIN