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We also deploy SNAPSHOT binaries to S3.
Setting up snapshot deployment for a new branch
When the release-branch for a version is created (see Creating a Flink Release) a new snapshot deployment must be setup in Jenkins.
Login at https://builds.apache.org/ with your Apache credentials.
On the main page, click on "New Item".
A dialog should've opened asking for a name and listing various templates.
Enter "flink-snapshot-deployment-X.Y" as the name, and copy the settings from an existing deployment by searching for "flink-snapshot-deployment" via the "Copy from" box.
Click "OK".
A configuration dialog should've opened.
Scroll down to "Source Code Management", and update the "Branches to build" to point to the branch you want to setup the snapshot deployment for.
Click "Save", and you're done.