What does install option of xcodebuild do

When running xcodebuild from the command line. What does the install option do?

xcodebuild -configuration release install

For the release scheme in this example, what switches does install flip?

The manual sadly does not elaborate and the man page for xcodebuild makes no explicit reference to install other than the command takes a <buildaction> argument

xcodebuild with the install option "builds the target and installs it into the target's installation directory in the distribution root (DSTROOT)."

(That quote is from here: https://keith.github.io/xcode-man-pages/xcodebuild.1.html#install which appears to be an older version of the xcodebuild man page.)

The current documentation reference is: https://developer.apple.com/documentation/xcode/build-settings-reference#Installation-Build-Products-Location

mentions xcodebuild install under DSTROOT:

Installation Build Products Location

Setting name: DSTROOT

The path at which all products will be rooted when performing an install build. For instance, to install your products on the system proper, set this path to /. Defaults to /tmp/$(PROJECT_NAME).dst to prevent a test install build from accidentally overwriting valid and needed data in the ultimate install path.

Typically this path is not set per target, but is provided as an option on the command line when performing an xcodebuild install. It may also be set in a build configuration in special circumstances.