58ad9048b9
Add the missing BRPC_WITH_UBRING Bazel configuration, wire it through the library and example targets, and document the supported build commands. Enable RDMA and UBRING in CI jobs whose all-options configurations did not exercise those features. Run both feature suites in the existing Bazel unit-test jobs and enable RDMA in the Make unit-test job. Use unsigned literals for UBRING atomic counter operations to match the counter type and avoid template deduction failures on stricter compilers. Signed-off-by: Zhengwei Zhu <141622927+ZhengweiZhu@users.noreply.github.com>