chore: add bazelrc for CI

This is required by the reusable workflow used for releases.
Fixes broken release build:
https://github.com/p0deje/rules_ruby/actions/runs/6947837138/job/18902520558

.github/workflows/ci.bazelrc

@@ -0,0 +1,10 @@
+# This file contains Bazel settings to apply on CI only.
+# It is referenced with a --bazelrc option in the call to bazel in ci.yaml
+
+# Debug where options came from
+build --announce_rc
+# Don't rely on test logs being easily accessible from the test runner,
+# though it makes the log noisier.
+test --test_output=errors
+# Allows tests to run bazelisk-in-bazel, since this is the cache folder used
+test --test_env=XDG_CACHE_HOME