build

Refactor build workflow and add check for update #1548

	name: build

	on:
	schedule:
	- cron: "0 12 * * *"
	push:
	paths-ignore:
	- "*.md"
	- "*.txt"
	- "*.png"
	pull_request:

	jobs:
	linting:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Run ShellCheck
	uses: ludeeus/action-shellcheck@master
	with:
	ignore_paths: tests/shunit2

	verify-signature:
	runs-on: ubuntu-latest
	if: github.repository == 'atmoz/sftp'
	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0 # for proper signature verification
	- name: Verify signature
	uses: atmoz/git-verify-ref@master
	with:
	import-github-users: atmoz

	build-images:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	with:
	submodules: true # for shunit2

	- name: alpine
	uses: ./.github/actions/build-image
	with:
	image: $GITHUB_REPOSITORY
	tag: alpine
	update-check: apk update &>/dev/null && apk version -q -l '>'

	- name: debian
	uses: ./.github/actions/build-image
	with:
	image: $GITHUB_REPOSITORY
	tag: debian
	update-check: apt-get update &>/dev/null && apt-get upgrade -s \| grep ^Inst

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