Revert "Remove code signing."

This reverts commit 3990f5ace27ec73f89f54ba66bf3b15d326b72e5.
Revert "Revert "Remove code signing""

This reverts commit 0fbd268ffaaf85f8172eddc8276807bc5a10ca41.
Revert "Remove code signing"

This reverts commit 5c5fc208656a82339b67a548b56a275aea28b267.