Reorganize platformio.ini, add SPIFFS/LittleFS support #190

	name: Test

	# The concurrency spec means that we'll only run one set of jobs per pull request or push to main.
	# If a new push or pull request comes in while a job is running, all jobs in the concurrency group will be cancelled.
	concurrency:
	group: test-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	on:
	push:
	branches:
	- main
	pull_request:

	jobs:
	test:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- uses: actions/cache@v4
	with:
	path: \|
	~/.cache/pip
	~/.platformio/.cache
	.pio/libdeps
	key: ${{ runner.os }}-pio

	- uses: actions/setup-python@v5
	with:
	python-version: '3.9'

	- name: Install PlatformIO Core
	run: pip install --upgrade platformio

	- name: Run tests
	run: \|
	pio test -e test-native

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