feat: Provide experimental images built from main (#3699) #1

	name: Build Devcontainer image
	on:
	workflow_dispatch:
	# no content, allows manual triggering

	schedule:
	# 5:30 pm every Sunday (UTC)
	# to pick up any important bug fixes etc in base image
	- cron: '30 17 * * 0'

	push:
	# run when changes pushed to main branch if any devcontainer files changed
	branches:
	- main
	paths:
	- .devcontainer/**

	jobs:
	# Based on: https://docs.github.com/en/actions/guides/publishing-docker-images#publishing-images-to-github-packages
	build-devcontainer-image:
	runs-on: ubuntu-latest

	permissions:
	packages: write
	contents: read

	steps:
	- name: Checkout code
	uses: actions/checkout@v3

	- name: Log in to GitHub Docker Registry
	uses: docker/login-action@v2
	with:
	registry: docker.pkg.github.com # ghcr.io not yet enabled for Azure org
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build & push Devcontainer image
	uses: docker/build-push-action@v4
	with:
	context: .devcontainer
	push: true
	# Build an image usable as cache-from, per: https://docs.docker.com/engine/reference/commandline/build/#specifying-external-cache-sources
	build-args: BUILDKIT_INLINE_CACHE=1
	tags: \|
	docker.pkg.github.com/azure/azure-service-operator/aso-devcontainer:latest
	docker.pkg.github.com/azure/azure-service-operator/aso-devcontainer:${{ github.sha }}

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