Allow using a shared repository cache and install base for our integration tests.
Allow using a shared repository cache and install base for our integration tests.

This change doesn't do anything (besides printing a message) unless you run Bazel's tests with the new environment variables.

The environment variables will be set to appropriate platform-specific values by the CI scripts.

PiperOrigin-RevId: 231389821

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