Add "datastores" to represent input data from zarr, npy, etc #73

	# cicd workflow for running tests with pytest
	# needs to first install pdm, then install torch cpu manually and then install the package
	# then run the tests

	name: test (pdm install, cpu)

	on: [push, pull_request]

	jobs:
	tests:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2

	- name: Install pdm
	run: \|
	python -m pip install pdm

	- name: Create venv
	run: \|
	pdm venv create --with-pip
	pdm use --venv in-project

	- name: Install torch (CPU)
	run: \|
	pdm run python -m pip install torch --index-url https://download.pytorch.org/whl/cpu
	# check that the CPU version is installed

	- name: Install package (including dev dependencies)
	run: \|
	pdm install --group :all

	- name: Print and check torch version
	run: \|
	pdm run python -c "import torch; print(torch.__version__)"
	pdm run python -c "import torch; assert torch.__version__.endswith('+cpu')"

	- name: Load cache data
	uses: actions/cache/restore@v4
	with:
	path: data
	key: ${{ runner.os }}-meps-reduced-example-data-v0.1.0
	restore-keys: \|
	${{ runner.os }}-meps-reduced-example-data-v0.1.0

	- name: Run tests
	run: \|
	pdm run pytest

	- name: Save cache data
	uses: actions/cache/save@v4
	with:
	path: data
	key: ${{ runner.os }}-meps-reduced-example-data-v0.1.0

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