docs: Update build-devcontainer.yml docs #20

	name: 'build devcontainer image'

	on:
	# rebuild any PRs and main branch changes
	pull_request:
	# only rebuild devcontainer image if files in ./github/** are changed
	paths:
	- '.github/**'
	push:
	branches:
	- main
	- develop
	# only rebuild devcontainer image if files in ./github/** are changed
	paths:
	- '.github/**'

	permissions:
	# write-all is too much, but we need to write to packages
	# see https://github.com/orgs/community/discussions/57724 for more info
	contents: read
	packages: write
	attestations: write
	id-token: write

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout (GitHub)
	uses: actions/checkout@v4

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- uses: "./.github/shared/devcontainer-image-name"
	id: devcontainer_image_name

	- name: Pre-build image and run make ci-build in dev container
	uses: devcontainers/ci@v0.3
	with:
	# push image only if the branch is main and the event is push
	push: filter
	refFilterForPush: \|
	refs/heads/main
	refs/heads/develop
	# "push" is already the default
	# eventFilterForPush: push

	# use the devcontainer_image_name output variable produced by ./.github/shared/devcontainer-image-name.yaml
	imageName: ${{ steps.devcontainer_image_name.outputs.image_name }}

	# make some tests to test the devcontainer image is working
	runCmd: \|
	# test if pnpm is properly installed
	command -v pnpm
	# test if devcontainer environment is properly set
	env \| grep WP_ENV_HOME

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