Baseline #3

	# Save benchmark baseline after merging to main.
	#
	# This workflow runs the same benchmarks as benchmark.yml but in "save" mode:
	# it writes a baseline JSON to the GitHub Actions cache, keyed by commit SHA.
	#
	# benchmark.yml (on PRs) restores this cache to compare against, enabling
	# regression detection. Cache keys use prefix matching so the latest baseline
	# from main is always picked up, even across many merges.
	#
	# Triggered manually via workflow_dispatch (must be run from the main branch).

	name: Baseline

	on:
	workflow_dispatch:

	concurrency:
	group: baseline-${{ github.ref }}
	cancel-in-progress: true

	permissions:
	contents: read

	env:
	CARGO_TERM_COLOR: always

	jobs:
	test:
	name: Test Suite
	uses: ./.github/workflows/test.yml

	baseline:
	needs: test
	name: Save Benchmark Baseline
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Install Rust
	uses: dtolnay/rust-toolchain@stable

	- uses: Swatinem/rust-cache@v2
	with:
	prefix-key: bench

	# --save-baseline writes target/fluxbench/baseline.json with timing data
	# for all benchmarks. This becomes the comparison point for PR checks.
	- name: Run benchmarks and save baseline
	run: cargo run --example ci_regression -p fluxbench-examples --release -- --save-baseline

	# Cache keyed by SHA so each merge gets its own entry.
	# benchmark.yml uses restore-keys prefix matching to find the latest one.
	- name: Cache baseline
	uses: actions/cache/save@v4
	with:
	path: target/fluxbench/baseline.json
	key: fluxbench-baseline-${{ github.sha }}

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