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Zhengchao An
f0b1202b65
The weekly full ceph/s3-tests sweep (e2e-s3tests.yml, schedule path) has failed every recorded run. The 2026-07-05 run (rustfs/rustfs #28727691591) died at "Install Python tools" with `No module named pip`: the self-hosted `sm-standard-4` label is served by heterogeneous runners and the scheduled job landed on a minimal pod with neither `pip` (bare python3) nor `docker.sock`, so no test ever executed. Make the infrastructure assumptions explicit instead of trusting drifting self-hosted runner state: - Pin the job to GitHub-hosted `ubuntu-latest`, which reliably ships Docker, docker compose, python3 and pip. - Add an explicit actions/setup-python step before any pip usage so the workflow stays correct across runner-image drift. - Document the fix and rationale in the workflow header comment. Also quote the shell variables flagged by shellcheck (SC2086) in the Docker build/run steps and drop the unused loop variable (SC2034) so actionlint passes with zero findings on the changed file. The PR gate (ci.yml s3-implemented-tests) is unaffected: it avoids Docker via DEPLOY_MODE=binary and defers pip setup to run.sh's self-bootstrap. Refs: rustfs/backlog#1149 (ci-1), rustfs/backlog#1155