Deny run right to ci.bazel.io to authenticated users
Deny run right to ci.bazel.io to authenticated users

Anybody with a gmail account can trigger. So now only admin can
until we fix the authentication scheme correctly.

Change-Id: I2fdcb2c16686a1057a1d7b63d86a0f7a681f489a

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration