Speed up output-stage post-processing: hoist redundant per-surface trig recompute #1065

	name: C++ TSAN tests

	on:
	pull_request:
	push:
	branches:
	- main
	workflow_dispatch:

	# Cancel currently running job if a new one comes along for the same branch or tag.
	# From https://stackoverflow.com/a/72408109.
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref \|\| github.run_id }}
	cancel-in-progress: ${{ github.ref_name != 'main' }}

	jobs:
	tsan:
	name: Build and run tsan tests
	runs-on: ubuntu-22.04
	permissions:
	contents: read
	packages: read
	steps:
	- uses: actions/checkout@v4
	with:
	lfs: true # for the mgrid test data
	# The TSAN image (clang/libomp with ThreadSanitizer support) takes ~1h to
	# build, so it is prebuilt and pushed to GHCR by build_tsan_image.yaml and
	# only rebuilt when src/vmecpp/cpp/docker/tsan/ changes. Here we just pull
	# the cached image.
	- name: Log in to GHCR
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Pull TSAN Docker image
	run: \|
	IMAGE=ghcr.io/${{ github.repository_owner }}/vmecpp-tsan:latest
	docker pull "${IMAGE,,}"
	docker tag "${IMAGE,,}" proximafusion/tsan
	- name: Mount bazel cache
	uses: actions/cache@v4
	with:
	path: "~/.cache/bazel"
	key: bazel-tsan
	- name: Run TSAN tests in Docker
	run: \|
	docker run --rm \
	-v ${{ github.workspace }}:/vmecpp \
	-v ~/.cache/bazel:/root/.cache/bazel \
	proximafusion/tsan \
	bash -c "cd /vmecpp/src/vmecpp/cpp && bazel test --config=tsan_archer_in_docker --jobs=1 --test_output=errors -- //vmecpp/... -//vmecpp/vmec/pybind11/..."

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