Use alpine 3.21 (CMake 3.21), bump tests #31

	# Runtime tests

	name: Runtime

	on:
	push:
	branches: ["master"]
	pull_request:
	branches: ["master"]

	jobs:
	test:
	name: Runtime
	runs-on: ubuntu-latest
	container: python:3.13-alpine3.21

	steps:
	- name: Install Alpine Dependencies
	run: apk add cmake git make
	- name: Display Python version
	run: python -c "import sys; print(sys.version)"
	- name: Display CMake version
	run: cmake --version
	- name: Display Git version
	run: git --version

	- uses: actions/checkout@v4
	with:
	submodules: recursive

	- name: Install Dependencies
	run: pip install -e .
	- name: Test
	run: cmake . && ctest -VV .

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