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Switch to pixi #338

	---
	name: main
	# Automatically cancel a previous run.
	concurrency:
	group: ${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true
	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- '*'
	jobs:
	run-tests:
	name: Run tests for ${{ matrix.os }} on ${{ matrix.python-version }}
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os:
	- ubuntu-latest
	- macos-latest
	- windows-latest
	python-version:
	- '3.12'
	steps:
	- uses: actions/checkout@v4
	- uses: prefix-dev/[email protected]
	with:
	pixi-version: v0.23.0
	cache: true
	cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
	environments: test-cpu
	activate-environment: true
	- name: Run pytest
	shell: bash -l {0}
	# Cannot use `pixi run -e test-cpu tests` because the test-cpu environment
	# overlaps with the test-gpu environment, which is erroneously checked and
	# fails on CI because CUDA12 is not installed. Therefore we run pytest directly
	# inside the activated test-cpu environment.
	run: pytest tests --cov-report=xml --cov=./
	- name: Upload coverage report
	if: runner.os == 'Linux' && matrix.python-version == '3.12'
	uses: codecov/codecov-action@v4
	run-mypy:
	name: Run mypy on Python 3.12
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	steps:
	- uses: actions/checkout@v4
	- uses: prefix-dev/[email protected]
	with:
	pixi-version: v0.23.0
	cache: true
	cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
	environments: mypy
	- name: Run mypy
	shell: bash -l {0}
	run: pixi run mypy

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