Running tests for BCR

Updates bazel version and adds platforms

Passed in 45s
:pipeline:curl -sS "https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?$(date +%s)" -o bazelci.py && python3.6 bazelci.py project_pipeline | tee /dev/tty | buildkite-agent pipeline upload
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Ran in 9s
ubuntu on :ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1738743686 -o bazelci.py && python3.8 bazelci.py runner --task=linux
Waited 5s
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Total Job Run Time: 40s