Docker publish action

[wesley-dean]

While scanning through j2lint's workflows, I saw that the release action has the Docker publishing steps commented out:

j2lint/.github/workflows/release.yml

Lines 30 to 70 in ba3ae40

	# TODO: in a separate PR
	# docker:
	# name: Docker Image Build
	# runs-on: ubuntu-latest
	# needs: [pypi]
	# strategy:
	# matrix:
	# platform:
	# - linux/amd64
	# - linux/arm64
	# - linux/arm/v7
	# - linux/arm/v8
	# steps:
	# - name: Checkout
	# uses: actions/checkout@v4
	# - name: Docker meta for TAG
	# id: meta
	# uses: docker/metadata-action@v5
	# with:
	# images: ghcr.io/${{ github.repository }}
	# tags: |
	# type=semver,pattern={{version}}
	# type=raw,value=latest
	# - name: Login to GitHub Container Registry
	# uses: docker/login-action@v3
	# with:
	# registry: ghcr.io
	# username: ${{ github.actor }}
	# password: ${{ secrets.GITHUB_TOKEN }}
	# - name: Build and push
	# uses: docker/build-push-action@v6
	# with:
	# context: .
	# file: Dockerfile
	# push: true
	# platforms: linux/amd64
	# tags: ${{ steps.meta.outputs.tags }}
	# labels: ${{ steps.meta.outputs.labels }}

I happen to maintain a workflow that does exactly what's being done there: https://github.com/marketplace/actions/publish-image

Example: https://github.com/wesley-dean/jinja2-cli/blob/master/.github/workflows/build_docker_image.yml

I see PR #5 includes a Dockerfile, so that (or something like it) would need to be included so that the aforementioned workflow would be able to build.

I can put together a PR for the workflow if that's of any interest.

Thanks!