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>
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