add west cache #31

	name: Build Demo

	on:
	push:
	pull_request:

	jobs:
	build:
	runs-on: ubuntu-22.04
	container: ghcr.io/zephyrproject-rtos/ci:v0.26.2
	env:
	CMAKE_PREFIX_PATH: /opt/toolchains
	ZEPHYR_VERSION: v3.6-branch
	# Board to use with renode
	BOARD: nrf52833dk_nrf52833
	strategy:
	matrix:
	board: ["esp32", "nrf52833dk_nrf52833"]
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	submodules: true

	# Cache the west workspace
	- name: Cache west workspace
	id: cache-west
	uses: actions/cache@v3
	with:
	path: /tmp/west
	key: ${{ runner.os }}-west-${{ hashFiles('**/west.yml') }}
	restore-keys: \|
	${{ runner.os }}-west-

	# Only run initialization if the cache was not restored
	- name: Initialize
	if: steps.cache-west.outputs.cache-hit != 'true'
	run: \|
	mkdir -p /tmp/west
	cd /tmp/west
	west init
	west update -o=--depth=1 -n

	# Matrix-specific build step
	- name: Build PoC
	working-directory: /tmp/west
	run: \|
	west build $GITHUB_WORKSPACE/samples/demo -b ${{ matrix.board }} --build-dir $GITHUB_WORKSPACE/build

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