Update postgis/postgis:16-3.4-alpine Docker digest to 94549a0 #20

	name: build & publish Docker image

	on:
	push:
	branches:
	- main

	jobs:
	build-publish:
	runs-on: ubuntu-latest
	steps:
	- name: checkout
	uses: actions/checkout@v4

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

	- name: log into the GitHub Container Registry
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ github.token }}

	- name: compute Docker image tag
	id: docker-tags
	run: \|
	echo "permanent-tag=$(date +"%Y-%m-%dT%H.%M.%S")-${GITHUB_SHA:0:7}" >>$GITHUB_OUTPUT

	- name: build and push Docker image
	uses: docker/build-push-action@v6
	with:
	push: true
	tags: \|
	ghcr.io/${{ github.repository }}:latest
	ghcr.io/${{ github.repository }}:${{ steps.docker-tags.outputs.permanent-tag }}
	# todo: add linux/arm64 once postgis/postgis supports it
	# see also https://github.com/postgis/docker-postgis/issues/216
	platforms: linux/amd64
	# https://docs.docker.com/build/ci/github-actions/cache/#cache-backend-api
	cache-from: type=gha
	cache-to: type=gha,mode=max

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