Add instructions for embed Bazel version when building from source

Failed in 34m 6s
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:darwin: macOS Failures

  • //src/test/java/com/google/devtools/build/lib/server:ServerTests TIMEOUT in 3 out of 3 run(s) over 900.5s (300.2s + 300.2s + 300.1s): log
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:mac: macOS (shard 10)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1719435244 -o bazelci.py && python3 bazelci.py runner --task=macos_v2 --http_config=https://raw.githubusercontent.com/fweikert/bazel/macos_v2/.bazelci/postsubmit.yml
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Total Job Run Time: 3h 38m