Add a nightly.yml config that will be used to build / test Bazel nightlies.
Add a nightly.yml config that will be used to build / test Bazel nightlies.

RELNOTES: None.
PiperOrigin-RevId: 213973887

meteorcloudy/bazel,aehlig/bazel,dslomov/bazel-windows,davidzchen/bazel,cushon/bazel,werkt/bazel,perezd/bazel,aehlig/bazel,safarmer/bazel,bazelbuild/bazel,dslomov/bazel-windows,katre/bazel,katre/bazel,meteorcloudy/bazel,perezd/bazel,davidzchen/bazel,ulfjack/bazel,ulfjack/bazel,dslomov/bazel-windows,bazelbuild/bazel,aehlig/bazel,akira-baruah/bazel,werkt/bazel,meteorcloudy/bazel,davidzchen/bazel,dslomov/bazel,dslomov/bazel-windows,twitter-forks/bazel,perezd/bazel,dslomov/bazel,meteorcloudy/bazel,davidzchen/bazel,dslomov/bazel,akira-baruah/bazel,safarmer/bazel,werkt/bazel,akira-baruah/bazel,dslomov/bazel,davidzchen/bazel,bazelbuild/bazel,twitter-forks/bazel,cushon/bazel,ulfjack/bazel,twitter-forks/bazel,perezd/bazel,meteorcloudy/bazel,bazelbuild/bazel,aehlig/bazel,ulfjack/bazel,ButterflyNetwork/bazel,ButterflyNetwork/bazel,dslomov/bazel,twitter-forks/bazel,dslomov/bazel-windows,ButterflyNetwork/bazel,twitter-forks/bazel,twitter-forks/bazel,bazelbuild/bazel,katre/bazel,cushon/bazel,akira-baruah/bazel,twitter-forks/bazel,cushon/bazel,ButterflyNetwork/bazel,meteorcloudy/bazel,akira-baruah/bazel,ButterflyNetwork/bazel,dslomov/bazel,cushon/bazel,werkt/bazel,dslomov/bazel-windows,werkt/bazel,akira-baruah/bazel,ulfjack/bazel,safarmer/bazel,katre/bazel,aehlig/bazel,katre/bazel,dslomov/bazel,katre/bazel,perezd/bazel,davidzchen/bazel,werkt/bazel,perezd/bazel,cushon/bazel,davidzchen/bazel,safarmer/bazel,meteorcloudy/bazel,ulfjack/bazel,bazelbuild/bazel,safarmer/bazel,ulfjack/bazel,safarmer/bazel,aehlig/bazel,perezd/bazel,ButterflyNetwork/bazel,aehlig/bazel