In the Archives organizer, you can export these files to distribute an app outside of the App Store, or export these files just before you upload a build to iTunes Connect:
DistributionSummary.plist: Contains signing, provisioning, and entitlements information.
ExportOptions.plist: Contains the distribution method, distribution options, and distribution signing options you selected.
[installer file]: For iOS, tvOS, and watchOS apps, this is an iOS App File (with a .ipa file extension) and for macOS apps, this is an installer package (with a .pkg file extension).
Packaging.log: Contains the commands Xcode used to transform the archive in to the installer file.
You can pass the ExportOptions.plist file as the exportOptionsPlist option to the xcodebuild command, or specify this file in the Archive action settings of a continuous integration bot.