v16

 * docker: bump rsync Debian version
 * add APK signing logic
 * phase1: make IsNoMasterBuild function more flexible
 * CI(deps): Bump docker/build-push-action from 5 to 6
 * phase1: kmodprepare: add apk compat
 * phase1: AnyBranchScheduler: make treeStableTimer configurable
 * phase1: make list of builders configurable
 * phase1: factor out populateTargetsForBranch
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