Derive release branch name #1571

	name: Docker Build

	on:
	push:
	branches:
	- main
	workflow_call:
	inputs:
	ref:
	description: 'Git reference'
	required: true
	type: string
	tag:
	description: 'Docker tag'
	required: true
	type: string
	default: 'latest'

	jobs:
	build:
	name: Build Docker Image
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v4
	if: github.event_name != 'push' && inputs.tag != 'latest'
	with:
	ref: ${{ inputs.ref }}
	- uses: actions/checkout@v4
	if: github.event_name == 'push'
	- name: Set Docker tag
	if: github.event_name != 'push' && inputs.tag != 'latest'
	run: echo "DOCKER_TAG=${{ inputs.tag }}" >> $GITHUB_ENV
	- name: Use default Docker tag
	if: github.event_name == 'push'
	run: echo "DOCKER_TAG=latest" >> $GITHUB_ENV
	- name: Set lowercase repository name
	run: echo "REPOSITORY_LC=${REPOSITORY,,}" >> $GITHUB_ENV
	env:
	REPOSITORY: '${{ github.repository }}'
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	- name: Login to GitHub registry
	uses: docker/login-action@v3
	with:
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	registry: ghcr.io
	- uses: docker/build-push-action@v6
	with:
	tags: ghcr.io/${{ env.REPOSITORY_LC }}:${{ env.DOCKER_TAG }}
	platforms: linux/amd64
	outputs: \|
	type=registry
	type=local,dest=artifacts
	- name: Rename binary artifact
	run: mv artifacts/usr/bin/swiftlint artifacts/usr/bin/swiftlint_linux_amd64
	- name: Upload binary artifact
	if: github.event_name != 'push'
	uses: actions/upload-artifact@v4
	with:
	name: swiftlint_linux_amd64
	path: artifacts/usr/bin/swiftlint_linux_amd64
	if-no-files-found: error
	retention-days: 2

Provide feedback