gitlab-ci: Add jobs to make Windows x86_64 and i386 packages
Run CPack in a separate job for nightly binaries, and not at all for release binaries. Unlike macOS disk images (.dmg), we cannot sign the binaries inside Windows installers (.msi) after-the-fact. Instead, produce enough artifacts from the build job to sign and package release binaries manually.
Port build settings from Utilities/Release/win/x86/Dockerfile
and its
helper scripts.