Workflow: release automation +minor #13

	name: Build on ubuntu and maybe release

	on:
	push:
	pull_request:

	jobs:
	build:
	env:
	RELEASE_OS: ubuntu-24.04
	RELEASE_GOVER: "1.22"

	strategy:
	fail-fast: false
	matrix:
	os: [ ubuntu-24.04, ubuntu-22.04, ubuntu-20.04 ]
	gover: [ "1.22", "1.21", "1.20" ]

	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v5
	with:
	go-version: ${{ matrix.gover }}
	- name: Build the project
	run: go build .
	- name: Save built binary
	if: startsWith(github.ref, 'refs/tags/') && matrix.os == env.RELEASE_OS && matrix.gover == env.RELEASE_GOVER
	uses: actions/upload-artifact@v4
	with:
	name: artifact
	path: ./docker-on-top
	if-no-files-found: error
	retention-days: 1

	release:
	needs: build
	if: startsWith(github.ref, 'refs/tags/')

	runs-on: ubuntu-latest

	permissions:
	contents: write

	steps:
	- uses: actions/checkout@v4
	- name: Prepare release notes
	run: \|
	# Assert that the changelog begins with this release
	head -1 CHANGELOG.md \| grep -E "^# ${{ github.ref_name }}$"
	# Extract the part of changelog for this release (until next first-level heading)
	tail -n +2 CHANGELOG.md \| sed '/^# /q' \| head -n-1 > this-changelog.md
	- name: Restore built binary
	uses: actions/download-artifact@v4
	with:
	name: artifact
	path: ./
	- name: Release new version
	uses: softprops/action-gh-release@v2
	with:
	body_path: ./this-changelog.md
	fail_on_unmatched_files: true
	files: \|
	./docker-on-top
	./docker-on-top.service

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