fix: short link expansion #34

	name: Docker

	on:
	push:

	env:
	IMAGE_NAME: tail-web

	concurrency:
	group: "${{ github.workflow }} @ ${{ github.event.pull_request.head.label \|\| github.head_ref \|\| github.ref }}"
	cancel-in-progress: true

	jobs:
	push:
	runs-on: ubuntu-latest
	permissions:
	packages: write
	contents: read
	steps:
	- uses: actions/checkout@v2
	- uses: docker/setup-buildx-action@v1

	- name: Generate Image Tag
	id: image-tag
	run: \|
	IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME

	# Change all uppercase to lowercase
	IMAGE_ID=$(echo $IMAGE_ID \| tr '[A-Z]' '[a-z]')

	# Strip git ref prefix from version
	VERSION=$(echo "${{ github.ref }}" \| sed -e 's,./$.$,\1,')

	# Strip "v" prefix from tag name
	[[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION \| sed -e 's/^v//')

	# Use Docker `latest` tag convention
	[ "$VERSION" == "main" ] && VERSION=latest

	echo IMAGE_ID=$IMAGE_ID
	echo VERSION=$VERSION

	echo "::set-output name=TAG::${IMAGE_ID}:${VERSION}"

	- name: Log into GitHub Container Registry
	run: echo "${{ secrets.GITHUB_TOKEN }}" \| docker login ghcr.io -u ${{ github.actor }} --password-stdin

	- name: Build and push
	uses: docker/build-push-action@v2
	with:
	context: .
	push: true
	pull: true
	tags: ${{ steps.image-tag.outputs.TAG }}
	cache-from: type=gha
	cache-to: type=gha,mode=max
	platforms: linux/amd64

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