fcos: add s390x boot_device sugar #994

	# Maintained in https://github.com/coreos/repo-templates
	# Do not edit downstream.

	name: Container

	on:
	push:
	branches: [main]
	tags: ["v*"]
	pull_request:
	branches: [main]

	permissions:
	contents: read

	# avoid races when pushing containers built from main
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}

	jobs:
	build-container:
	name: Build container image
	runs-on: ubuntu-latest
	steps:
	- name: Check out repository
	uses: actions/checkout@v3
	with:
	# fetch tags so the compiled-in version number is useful
	fetch-depth: 0
	# If we're running on a signed tag, actions/checkout rewrites it into
	# a lightweight tag (!!!) which "git describe" then ignores. Rewrite
	# it back.
	# https://github.com/actions/checkout/issues/290
	- name: Fix actions/checkout synthetic tag
	run: git fetch --tags --force
	- name: Build and push container
	uses: coreos/actions-lib/build-container@main
	with:
	credentials: ${{ secrets.QUAY_AUTH }}
	push: quay.io/coreos/butane quay.io/coreos/fcct
	arches: amd64 arm64
	# Speed up PR CI by skipping non-amd64
	pr-arches: amd64

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