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Automatic merge from submit-queue (batch tested with PRs 49222, 49333, 48708, 49337) Allow to override build date See https://reproducible-builds.org/ for why this is good and https://reproducible-builds.org/specs/source-date-epoch/ for the definition of this variable. Background: issue #48710 when trying to build the kubernetes package for the openSUSE Linux distribution ``` /usr/bin/hyperkube /usr/bin/kubeadm /usr/src/kubernetes/platforms/linux/amd64/e2e.test ``` had a date+time string embedded in them in the format 2018-08-15T19:08:34Z which meant that each build produced new binaries even when nothing actually changed. Those then had to be synced to mirrors, wasting their and our users' bandwidth.