Eliminate need for MACOS_CI_KEYCHAIN_PWD

Author: cboulay

.github/workflows/build.yml

@@ -150,10 +150,10 @@ jobs:
         env:
           MACOS_CERTIFICATE: ${{ secrets.PROD_MACOS_CERTIFICATE }}
           MACOS_CERTIFICATE_PWD: ${{ secrets.PROD_MACOS_CERTIFICATE_PWD }}
-          MACOS_CI_KEYCHAIN_PWD: ${{ secrets.PROD_MACOS_CI_KEYCHAIN_PWD }}
         run: |
           # Create temporary keychain
           KEYCHAIN_PATH=$RUNNER_TEMP/build.keychain
+          MACOS_CI_KEYCHAIN_PWD=$(openssl rand -base64 32)
           security create-keychain -p "$MACOS_CI_KEYCHAIN_PWD" $KEYCHAIN_PATH
           security default-keychain -s $KEYCHAIN_PATH
           security set-keychain-settings -lut 21600 $KEYCHAIN_PATH