[infra/github] Introduce workflow for rootfs generation #3

	# Generate root file system for CI/CD cross build
	name: 'Generate RootFS'

	on:
	pull_request:
	branches:
	- master
	- release/*
	paths:
	- '.github/workflows/generate-rootfs.yml'
	- 'tools/cross/**'
	push:
	branches:
	- master
	- release/*
	paths:
	- '.github/workflows/generate-rootfs.yml'
	- 'tools/cross/**'
	schedule:
	# Every 1st day of the month at midnight (korean time zone, UTC+9:00)
	- cron: '0 15 1 * *'
	workflow_dispatch:

	jobs:
	gen-rootfs:
	if: github.repository_owner == 'Samsung'
	runs-on: ubuntu-22.04
	strategy:
	matrix:
	os: [ focal, jammy, noble ]
	arch: [ arm, aarch64 ]
	fail-fast: false

	steps:
	- name: Install qemu
	uses: docker/setup-qemu-action@v3

	- name: Install debootstrap
	run: sudo apt-get update && sudo apt-get install -y debootstrap

	- name: Checkout
	uses: actions/checkout@v4

	- name: Generate RootFS
	run: \|
	pushd tools/cross
	sudo ./install_rootfs.sh ${{ matrix.arch }} ${{ matrix.os }} --skipunmount
	sudo umount --recursive rootfs \|\| true
	popd

	- name: Archive RootFS for PR
	uses: actions/upload-artifact@v4
	with:
	name: rootfs_${{ matrix.arch }}_${{ matrix.os }}
	# Set short-lived artifacts for PRs only to avoid cluttering the storage.
	retention-days: ${{ github.event_name == 'pull_request' && '3' \|\| '60' }}
	path: \|
	tools/cross/rootfs/${{ matrix.arch }}/bin/
	tools/cross/rootfs/${{ matrix.arch }}/lib/
	tools/cross/rootfs/${{ matrix.arch }}/usr/
	tools/cross/rootfs/${{ matrix.arch }}/etc/

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