How to release an update to Maven Central as both aar and apklib

I have used following two guides, go there in case of problems:
Sonatype OSS Maven Repository Usage Guide
Publish an aar file to Maven Central with Gradle
I have already added most of the required configurations to the project, but you need some setup on your machine. Particularly:
latest Java, Git, Maven, Gradle, Android SDK
GPG installed, public key distributed though their servers and path to the key and credentials in ~/.gradle/gradle.properties
Sonatype account and permissions to the project in Sonatype.

Push all changes to git
setup target version in gradle.properties in project root
run gradle uploadArchives in project root
go to Staging repositories, select repository and click Close.
Note: It's important to push aar first, because they have different poms and you want the pom generated by Maven (differences are caused by different handling of support library in Maven and Gradle)
run mvn release:prepare and mvn release:perform in project root
go to Staging repositories, select repository and click Close.
verify the merged release - it will be in the this repo
You can add temporary staging repository - to settings.xml in Maven and to build.gradle in Gradle and test it out
when everything is fine, let's do the final push. Go to Staging repositories and click Release - aar first, apklib second
- artefacts will be in Maven Central in about 2 hours

Provide feedback