Add a Docker Compose file. #8

	name: Deploy
	on:
	push:
	branches:
	- main
	env:
	IMAGE_NAME_BACKEND: ghcr.io/${{ github.repository_owner }}/backend
	IMAGE_NAME_LANDING: ghcr.io/${{ github.repository_owner }}/landing
	IMAGE_NAME_PWA: ghcr.io/${{ github.repository_owner }}/pwa
	jobs:
	deploy:
	name: Deploy
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	steps:
	- name: Checkout the repository
	uses: actions/checkout@v4
	- name: Get a tag for the images
	run: echo "IMAGE_TAG=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
	- name: Log in to registry
	run: echo "${{ secrets.GITHUB_TOKEN }}" \| docker login ghcr.io -u ${{ github.actor }} --password-stdin
	- name: Build the backend image
	run: docker build -t $IMAGE_NAME_BACKEND:$IMAGE_TAG backend
	- name: Build the landing image
	run: docker build -t $IMAGE_NAME_LANDING:$IMAGE_TAG landing
	- name: Build the PWA image
	run: docker build -t $IMAGE_NAME_PWA:$IMAGE_TAG pwa
	- name: Push the images
	run: \|
	docker push $IMAGE_NAME_BACKEND:$IMAGE_TAG
	docker push $IMAGE_NAME_LANDING:$IMAGE_TAG
	docker push $IMAGE_NAME_PWA:$IMAGE_TAG

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