Mark c_str() methods of nb::str and nb::bytes as const. #968

	name: Tests

	on:
	workflow_dispatch:
	pull_request:
	push:
	branches:
	- master
	- stable
	- v*

	concurrency:
	group: test-${{ github.ref }}
	cancel-in-progress: false

	jobs:
	# This is the "main" test suite, which tests a large number of different
	# versions of default compilers and Python versions in GitHub Actions.
	standard:
	strategy:
	fail-fast: false
	matrix:
	os: ['ubuntu-latest', 'windows-2022', 'macos-latest']
	python: ['3.8', '3.9', '3.10', '3.11', '3.12.0-rc.1', 'pypy3.9', 'pypy3.10']

	name: "Python ${{ matrix.python }} / ${{ matrix.os }}"
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v3
	with:
	submodules: true

	- name: Setup Python ${{ matrix.python }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python }}

	- name: Update CMake
	uses: jwlawson/actions-setup-cmake@v1.13

	- name: Install Eigen
	if: matrix.os == 'ubuntu-latest'
	run: sudo apt-get -y install libeigen3-dev

	- name: Install PyTest
	run: \|
	python -m pip install pytest pytest-github-actions-annotate-failures

	- name: Install NumPy
	if: matrix.python != 'pypy3.9' && matrix.python != 'pypy3.10' && matrix.python != '3.12.0-rc.1'
	run: \|
	python -m pip install numpy scipy

	- name: Configure
	run: >
	cmake -S . -B build -DNB_TEST_STABLE_ABI=ON -DNB_TEST_SHARED_BUILD="$(python3 -c 'import sys; print(int(sys.version_info.minor>=11))')"

	- name: Build C++
	run: cmake --build build -j 2

	- name: Run tests
	run: >
	cd build;
	python -m pytest

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