Run Bazel test suite on Linux ARM64 platform

Don't discard the analysis cache for null-configured targets (a.k.a. source files).

Failed in 1m 32s
:ubuntu: Ubuntu 20.04 LTS ARM64curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739402474 -o bazelci.py && python3.8 bazelci.py runner --task=ubuntu2004_arm64 --http_config=https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/pipelines/bazel-linux-arm64.yml?1739402473
Waited 9s
·
Ran in 46s
Total Job Run Time: 1m 23s