Publish imSim latest Docker image #118

	# CI workflow to publish the imSim:latest docker image.
	#
	# Image is built upon the latest release lsst_dist image.
	# i.e., https://pipelines.lsst.io/install/docker.html
	#
	# Author: Stuart McAlpine (stuart.mcalpine@fysik.su.se)

	name: Publish imSim latest Docker image

	on:
	# Can be triggered to run manually.
	workflow_dispatch:

	# Runs automatically every Satuarday at 7pm.
	schedule:
	- cron: '0 19 * * 6'

	# Login to dockerhub, build, and publish.
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Set current date as env variable
	run: echo "NOW=$(date +'%Y-%m-%dT%H:%M:%S')" >> $GITHUB_ENV
	- name: Checkout
	uses: actions/checkout@v3
	- name: Login to Docker Hub
	uses: docker/login-action@v2
	with:
	username: ${{ secrets.DOCKER_HUB_USERNAME }}
	password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2
	- name: Build and push
	uses: docker/build-push-action@v3
	with:
	context: .
	file: ./Dockerfile
	push: true
	tags: lsstdesc/imsim-env:latest
	build-args: BUILD_DATE=${{ env.NOW }}

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