readme: fix some diagrams #36

	name: Docker Main
	permissions:
	contents: read
	on:
	pull_request:

	jobs:
	publish:
	runs-on: ubuntu-22.04
	outputs:
	sha-tag: ${{ steps.metadata.outputs.sha-tag }}
	image: ${{ steps.metadata.outputs.image }}

	steps:
	- name: Checkout
	uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683

	- name: Set up QEMU
	uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2

	- name: Login to DockerHub
	uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772
	with:
	username: ${{ secrets.DOCKERHUB_USER }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Prepare Image Metadata
	id: metadata
	run: \|
	IMAGE=pomerium/mcp-app-demo
	SHA_TAG=git-${GITHUB_SHA::8}
	TAGS=${IMAGE}:main
	TAGS=${TAGS},${IMAGE}:${SHA_TAG}
	TS=$(date +%Y%m%d%H%M%S)
	echo "tags=${TAGS}" >> $GITHUB_OUTPUT
	echo "timestamp=${TS}" >> $GITHUB_OUTPUT
	echo "name=${IMAGE}" >> $GITHUB_OUTPUT
	echo "image=${IMAGE}" >> $GITHUB_OUTPUT
	echo "sha-tag=${SHA_TAG}" >> $GITHUB_OUTPUT

	- name: Docker Publish - Main
	uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1
	with:
	context: .
	file: ./Dockerfile
	push: false
	platforms: linux/amd64
	tags: ${{ steps.metadata.outputs.tags }}
	labels: \|
	org.opencontainers.image.created=${{ steps.metadata.outputs.timestamp }}
	org.opencontainers.image.name=${{ steps.metadata.outputs.name }}
	org.opencontainers.image.revision=${{ github.sha }}

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