add postgres 18 and upgrade pgbackrest #69

	name: Docker

	on:
	workflow_dispatch:
	push:
	branches: [ master ]

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: codestation/postgres

	jobs:
	build:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	strategy:
	matrix:
	pg_version: [14, 15, 16, 17, 18]

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Login to GitHub Container Registry
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

	- name: Set latest tag
	run: \|
	echo "Setting tags..."
	if [ "${{ matrix.pg_version }}" = "18" ]; then
	echo "LATEST_TAG=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest" >> $GITHUB_ENV
	else
	echo "LATEST_TAG=" >> $GITHUB_ENV
	fi

	- name: Build and push Docker image (postgres:${{ matrix.pg_version }})
	uses: docker/build-push-action@v6
	with:
	push: ${{ github.event_name != 'pull_request' }}
	tags: \|
	${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.pg_version }}
	${{ env.LATEST_TAG }}
	platforms: linux/amd64,linux/arm64
	file: ${{ matrix.pg_version }}/Dockerfile
	cache-from: type=gha
	cache-to: type=gha,mode=max
	labels: ${{ steps.meta.outputs.labels }}

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