add .bazelrc with remote config

This allows authenticated users to build and test
bazel on RBE. Most Bazel tests already work on RBE,
for a list (and progress update) on which don't yet
see https://github.com/bazelbuild/bazel/issues/8033

$ bazel build --config-remote src:bazel

Closes #8128.

PiperOrigin-RevId: 245041747

BUILD

diff --git a/BUILD b/BUILD
index 8394e66..681a9a4 100644
--- a/BUILD
+++ b/BUILD
@@ -21,7 +21,7 @@
         "//src:srcs",
         "//tools:srcs",
         "//third_party:srcs",
-    ] + glob([".bazelci/*"]),
+    ] + glob([".bazelci/*"]) + [".bazelrc"],
     visibility = ["//src/test/shell/bazel:__pkg__"],
 )