new(ci): add a sample kmod source to test that we are able to build a kmod after kernel headers are installed #1

	name: Test composite action
	on:
	pull_request:
	paths:
	- 'action.yml'
	workflow_dispatch:

	jobs:
	test-composite-action:
	runs-on: ubuntu-latest
	steps:
	- name: Echo kernelrelease
	run: uname -a

	- name: Test action
	uses: ./
	with:
	cache: 'true'

	- name: Check kernel sources
	run: ls -la /usr/src

	test-composite-action-cached:
	runs-on: ubuntu-latest
	needs: test-composite-action
	steps:
	- name: Echo kernelrelease
	run: uname -a

	- name: Store KERNEL_RELEASE
	shell: bash
	run: \|
	echo "KERNEL_RELEASE=$(uname -r)" >> $GITHUB_ENV

	- name: Check kernel sources (empty)
	run: ls -la /usr/src

	- name: Retrieve cached kernel sources
	uses: actions/cache@v4
	with:
	path: \|
	/usr/src/linux
	key: ${{ runner.os }}-${{ runner.arch }}-${{env.KERNEL_RELEASE}}

	- name: Check kernel sources again
	run: ls -la /usr/src

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