NoahKusaba opened a new pull request, #2408:
URL: https://github.com/apache/datafusion-ballista/pull/2408

   # Which issue does this PR close?
   
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   Closes #.
   
    # Rationale for this change
   
   The three benchmark workflows each inlined the same ~60 lines of setup and
   cluster lifecycle. This extracts the shared halves into
   `.github/actions/setup-benchmark-builder` (deps, toolchain, cache, build) and
   `ci/scripts/ballista_cluster.sh` (`start` / `stop`). Workflows drop from ~90
   lines of job body to ~40.
   
   `stop` is now its own step under `if: always()`, so teardown and the log dump
   also happen on a timeout or cancellation. The old `trap cleanup EXIT` only
   fired if the step's own shell exited.
   
   Fixes drift the three copies had accumulated:
   - tpch and h2o uploaded logs under `failure()`, discarding them on a hang,
     which is the case they exist for. Now `!success()`, matching tpcds.
   - tpch and h2o had no timeouts (6-hour default). All three now 45min job /
     30min step; observed passing jobs are 8-23min.
   - tpcds used `--concurrent-tasks`, a deprecated alias that warns. Now 
`--vcores`.
   
   Also fixes two readiness bugs present in all three copies. A dead process was
   waited on for the full 30s instead of failing immediately, and an open port 
was
   treated as proof of health (the executor binds its gRPC port before the 
Flight
   server and exits if that later bind fails).
   
   No new third-party actions,  the composite reuses the rust-cache pin already
   used across the repo.


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