internal/ci: add gcloud auth to the e2e tests
And un-skip the test script, now that it's set up to run in CI.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I7000939a0c8200426d6d8d174c564fa72246461a
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1171938
Reviewed-by: Roger Peppe <rogpeppe@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>