A whole bunch of new options were added!
Here's a quick overview of what new options can now be specified (in your action YAML). The corresponding arguments to xcodebuild are now also noted in the README as well as in the action.yml:
targetarchxcconfigjobsparallelize-targetsenable-code-coverageparallel-testing-enabledenable-address-sanitizerenable-thread-sanitizerenable-undefined-behavior-sanitizerresult-bundle-pathresult-bundle-versionskip-unavailable-actionsallow-provisioning-updatesallow-provisioning-device-registration