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## Problem - Benchmark periodic pagebench had inconsistent benchmarking results even when run with the same commit hash. Hypothesis is this was due to running on dedicated but virtualized EC instance with varying CPU frequency. - the dedicated instance type used for the benchmark is quite "old" and we increasingly get `An error occurred (InsufficientInstanceCapacity) when calling the StartInstances operation (reached max retries: 2): Insufficient capacity.` - periodic pagebench uses a snapshot of pageserver timelines to have the same layer structure in each run and get consistent performance. Re-creating the snapshot was a painful manual process (see https://github.com/neondatabase/cloud/issues/27051 and https://github.com/neondatabase/cloud/issues/27653) ## Summary of changes - Run the periodic pagebench on a custom hetzner GitHub runner with large nvme disk and governor set to defined perf profile - provide a manual dispatch option for the workflow that allows to create a new snapshot - keep the manual dispatch option to specify a commit hash useful for bi-secting regressions - always use the newest created snapshot (S3 bucket uses date suffix in S3 key, example `s3://neon-github-public-dev/performance/pagebench/shared-snapshots-2025-05-17/` - `--ignore` `test_runner/performance/pageserver/pagebench/test_pageserver_max_throughput_getpage_at_latest_lsn.py` in regular benchmarks run for each commit - improve perf copying snapshot by using `cp` subprocess instead of traversing tree in python ## Example runs with code in this PR: - run which creates new snapshot https://github.com/neondatabase/neon/actions/runs/15083408849/job/42402986376#step:19:55 - run which uses latest snapshot - https://github.com/neondatabase/neon/actions/runs/15084907676/job/42406240745#step:11:65