chore: Promisify `execFile`

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Unable to open agent private key path 'C:\secrets/agent.key'! Make sure your agent has this file deployed within it!

: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 7s
:ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1713392583 -o bazelci.py && python3.8 bazelci.py runner --task=ubuntu2004
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Total Job Run Time: 49s